/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_two_index_07.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 20:36:46,186 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 20:36:46,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 20:36:46,200 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 20:36:46,200 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 20:36:46,201 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 20:36:46,203 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 20:36:46,205 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 20:36:46,207 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 20:36:46,208 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 20:36:46,209 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 20:36:46,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 20:36:46,210 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 20:36:46,211 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 20:36:46,212 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 20:36:46,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 20:36:46,214 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 20:36:46,215 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 20:36:46,217 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 20:36:46,220 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 20:36:46,221 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 20:36:46,223 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 20:36:46,224 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 20:36:46,225 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 20:36:46,227 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-23 20:36:46,228 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-23 20:36:46,228 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-23 20:36:46,229 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-23 20:36:46,229 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-23 20:36:46,230 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-23 20:36:46,231 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-23 20:36:46,231 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-23 20:36:46,232 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-23 20:36:46,233 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-23 20:36:46,234 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-23 20:36:46,234 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-23 20:36:46,235 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-23 20:36:46,235 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-23 20:36:46,235 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 20:36:46,236 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 20:36:46,237 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 20:36:46,238 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 [2019-11-23 20:36:46,256 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 20:36:46,256 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 20:36:46,257 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 20:36:46,257 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 20:36:46,258 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 20:36:46,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 20:36:46,258 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 20:36:46,258 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 20:36:46,258 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 20:36:46,259 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 20:36:46,260 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 20:36:46,260 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 20:36:46,260 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 20:36:46,260 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 20:36:46,260 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 20:36:46,261 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 20:36:46,261 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 20:36:46,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 20:36:46,261 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 20:36:46,262 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 20:36:46,536 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 20:36:46,549 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 20:36:46,553 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 20:36:46,555 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 20:36:46,555 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 20:36:46,556 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_07.i [2019-11-23 20:36:46,632 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b55a21846/c768eae2431c49659d0dffd3d4aecbed/FLAG359050409 [2019-11-23 20:36:47,069 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 20:36:47,069 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_07.i [2019-11-23 20:36:47,076 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b55a21846/c768eae2431c49659d0dffd3d4aecbed/FLAG359050409 [2019-11-23 20:36:47,470 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b55a21846/c768eae2431c49659d0dffd3d4aecbed [2019-11-23 20:36:47,479 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 20:36:47,480 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 20:36:47,481 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 20:36:47,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 20:36:47,485 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 20:36:47,486 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c450792 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47, skipping insertion in model container [2019-11-23 20:36:47,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,497 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 20:36:47,515 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 20:36:47,715 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:36:47,722 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 20:36:47,746 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:36:47,767 INFO L208 MainTranslator]: Completed translation [2019-11-23 20:36:47,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47 WrapperNode [2019-11-23 20:36:47,767 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 20:36:47,768 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 20:36:47,768 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 20:36:47,768 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 20:36:47,775 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,861 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,882 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 20:36:47,883 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 20:36:47,883 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 20:36:47,883 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 20:36:47,891 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,891 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,893 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,893 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,899 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,904 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,905 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (1/1) ... [2019-11-23 20:36:47,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 20:36:47,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 20:36:47,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 20:36:47,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 20:36:47,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (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 [2019-11-23 20:36:47,982 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 20:36:47,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 20:36:47,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 20:36:47,983 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 20:36:47,983 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 20:36:47,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 20:36:48,192 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 20:36:48,192 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-23 20:36:48,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:48 BoogieIcfgContainer [2019-11-23 20:36:48,194 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 20:36:48,195 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 20:36:48,195 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 20:36:48,198 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 20:36:48,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:36:47" (1/3) ... [2019-11-23 20:36:48,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34fdcae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:48, skipping insertion in model container [2019-11-23 20:36:48,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:47" (2/3) ... [2019-11-23 20:36:48,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34fdcae0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:48, skipping insertion in model container [2019-11-23 20:36:48,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:48" (3/3) ... [2019-11-23 20:36:48,202 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_07.i [2019-11-23 20:36:48,213 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 20:36:48,220 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 20:36:48,232 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 20:36:48,255 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 20:36:48,255 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 20:36:48,255 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 20:36:48,256 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 20:36:48,256 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 20:36:48,256 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 20:36:48,256 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 20:36:48,256 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 20:36:48,269 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-23 20:36:48,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 20:36:48,274 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:48,275 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:48,276 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:48,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:48,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2019-11-23 20:36:48,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:48,291 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483709217] [2019-11-23 20:36:48,291 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:48,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:48,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 20:36:48,455 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483709217] [2019-11-23 20:36:48,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:36:48,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:36:48,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693145672] [2019-11-23 20:36:48,463 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:36:48,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:48,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:36:48,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:36:48,519 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2019-11-23 20:36:48,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:48,634 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2019-11-23 20:36:48,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:36:48,636 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 20:36:48,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:48,647 INFO L225 Difference]: With dead ends: 28 [2019-11-23 20:36:48,647 INFO L226 Difference]: Without dead ends: 12 [2019-11-23 20:36:48,652 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:36:48,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-23 20:36:48,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-23 20:36:48,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-23 20:36:48,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2019-11-23 20:36:48,702 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2019-11-23 20:36:48,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:48,703 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2019-11-23 20:36:48,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:36:48,704 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2019-11-23 20:36:48,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-23 20:36:48,705 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:48,706 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:48,707 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:48,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:48,708 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2019-11-23 20:36:48,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:48,709 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167873766] [2019-11-23 20:36:48,709 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:48,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:48,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:36:48,752 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167873766] [2019-11-23 20:36:48,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:36:48,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:36:48,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773432965] [2019-11-23 20:36:48,754 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:36:48,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:48,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:36:48,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:36:48,756 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2019-11-23 20:36:48,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:48,810 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-11-23 20:36:48,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:36:48,810 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-23 20:36:48,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:48,811 INFO L225 Difference]: With dead ends: 24 [2019-11-23 20:36:48,812 INFO L226 Difference]: Without dead ends: 18 [2019-11-23 20:36:48,813 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:36:48,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-23 20:36:48,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2019-11-23 20:36:48,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-23 20:36:48,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-11-23 20:36:48,817 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2019-11-23 20:36:48,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:48,818 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-11-23 20:36:48,818 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:36:48,818 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-11-23 20:36:48,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-23 20:36:48,819 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:48,819 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:48,819 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:48,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:48,820 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2019-11-23 20:36:48,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:48,821 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865425998] [2019-11-23 20:36:48,821 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:48,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:48,903 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:36:48,904 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865425998] [2019-11-23 20:36:48,904 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675238797] [2019-11-23 20:36:48,904 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 [2019-11-23 20:36:48,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:48,961 INFO L255 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:36:48,966 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:49,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:36:49,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:49,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2019-11-23 20:36:49,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781774085] [2019-11-23 20:36:49,017 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 20:36:49,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:49,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 20:36:49,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:36:49,018 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 6 states. [2019-11-23 20:36:49,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:49,097 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-11-23 20:36:49,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-23 20:36:49,100 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-11-23 20:36:49,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:49,100 INFO L225 Difference]: With dead ends: 35 [2019-11-23 20:36:49,101 INFO L226 Difference]: Without dead ends: 26 [2019-11-23 20:36:49,101 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:36:49,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-23 20:36:49,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 16. [2019-11-23 20:36:49,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-23 20:36:49,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-11-23 20:36:49,111 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2019-11-23 20:36:49,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:49,112 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-11-23 20:36:49,112 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 20:36:49,112 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-11-23 20:36:49,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-23 20:36:49,113 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:49,114 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:49,315 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:49,316 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:49,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:49,317 INFO L82 PathProgramCache]: Analyzing trace with hash -588918413, now seen corresponding path program 2 times [2019-11-23 20:36:49,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:49,318 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784918824] [2019-11-23 20:36:49,318 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:49,428 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-23 20:36:49,429 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784918824] [2019-11-23 20:36:49,429 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7000942] [2019-11-23 20:36:49,429 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 [2019-11-23 20:36:49,493 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:36:49,493 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:49,494 INFO L255 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 20:36:49,496 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:49,556 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 20:36:49,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:49,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2019-11-23 20:36:49,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907132790] [2019-11-23 20:36:49,558 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-23 20:36:49,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:49,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-23 20:36:49,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2019-11-23 20:36:49,559 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 9 states. [2019-11-23 20:36:49,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:49,644 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2019-11-23 20:36:49,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-23 20:36:49,645 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 14 [2019-11-23 20:36:49,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:49,646 INFO L225 Difference]: With dead ends: 45 [2019-11-23 20:36:49,646 INFO L226 Difference]: Without dead ends: 35 [2019-11-23 20:36:49,647 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2019-11-23 20:36:49,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-23 20:36:49,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 20. [2019-11-23 20:36:49,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-23 20:36:49,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-23 20:36:49,653 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 14 [2019-11-23 20:36:49,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:49,653 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-23 20:36:49,653 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-23 20:36:49,654 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-23 20:36:49,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-23 20:36:49,654 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:49,655 INFO L410 BasicCegarLoop]: trace histogram [6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:49,855 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:49,856 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:49,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:49,857 INFO L82 PathProgramCache]: Analyzing trace with hash -825242030, now seen corresponding path program 3 times [2019-11-23 20:36:49,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:49,858 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403976843] [2019-11-23 20:36:49,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:49,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:50,017 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-23 20:36:50,017 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403976843] [2019-11-23 20:36:50,017 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972873109] [2019-11-23 20:36:50,018 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 [2019-11-23 20:36:50,078 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 20:36:50,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:50,080 INFO L255 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 20:36:50,082 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:50,102 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-23 20:36:50,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:50,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-11-23 20:36:50,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464966095] [2019-11-23 20:36:50,103 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-23 20:36:50,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:50,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-23 20:36:50,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 20:36:50,104 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 7 states. [2019-11-23 20:36:50,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:50,172 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2019-11-23 20:36:50,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 20:36:50,172 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2019-11-23 20:36:50,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:50,173 INFO L225 Difference]: With dead ends: 47 [2019-11-23 20:36:50,173 INFO L226 Difference]: Without dead ends: 41 [2019-11-23 20:36:50,174 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 20:36:50,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-23 20:36:50,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 21. [2019-11-23 20:36:50,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-23 20:36:50,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-23 20:36:50,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 18 [2019-11-23 20:36:50,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:50,180 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-23 20:36:50,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-23 20:36:50,180 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-23 20:36:50,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-23 20:36:50,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:50,181 INFO L410 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:50,385 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:50,385 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:50,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:50,386 INFO L82 PathProgramCache]: Analyzing trace with hash 238747000, now seen corresponding path program 4 times [2019-11-23 20:36:50,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:50,387 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206873508] [2019-11-23 20:36:50,388 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:50,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:50,469 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-23 20:36:50,469 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206873508] [2019-11-23 20:36:50,470 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509055984] [2019-11-23 20:36:50,470 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 [2019-11-23 20:36:50,524 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:36:50,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:50,526 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 20:36:50,527 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-23 20:36:50,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:50,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2019-11-23 20:36:50,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096052446] [2019-11-23 20:36:50,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-23 20:36:50,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:50,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-23 20:36:50,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:36:50,606 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 14 states. [2019-11-23 20:36:50,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:50,720 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2019-11-23 20:36:50,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-23 20:36:50,721 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 19 [2019-11-23 20:36:50,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:50,721 INFO L225 Difference]: With dead ends: 64 [2019-11-23 20:36:50,722 INFO L226 Difference]: Without dead ends: 52 [2019-11-23 20:36:50,722 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:36:50,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-23 20:36:50,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 27. [2019-11-23 20:36:50,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-23 20:36:50,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-23 20:36:50,728 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2019-11-23 20:36:50,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:50,729 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-23 20:36:50,729 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-23 20:36:50,729 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-23 20:36:50,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-23 20:36:50,730 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:50,730 INFO L410 BasicCegarLoop]: trace histogram [11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:50,940 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:50,940 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:50,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:50,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1524497271, now seen corresponding path program 5 times [2019-11-23 20:36:50,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:50,942 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061494179] [2019-11-23 20:36:50,943 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:50,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:51,045 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-23 20:36:51,046 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061494179] [2019-11-23 20:36:51,046 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988816773] [2019-11-23 20:36:51,046 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 [2019-11-23 20:36:51,516 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-23 20:36:51,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:51,518 INFO L255 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 20:36:51,521 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:51,651 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-23 20:36:51,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:51,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14] total 19 [2019-11-23 20:36:51,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302873346] [2019-11-23 20:36:51,653 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-23 20:36:51,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:51,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-23 20:36:51,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:36:51,656 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 19 states. [2019-11-23 20:36:51,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:51,812 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2019-11-23 20:36:51,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-23 20:36:51,812 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 25 [2019-11-23 20:36:51,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:51,813 INFO L225 Difference]: With dead ends: 76 [2019-11-23 20:36:51,813 INFO L226 Difference]: Without dead ends: 63 [2019-11-23 20:36:51,816 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2019-11-23 20:36:51,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-11-23 20:36:51,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 33. [2019-11-23 20:36:51,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-23 20:36:51,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-23 20:36:51,828 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 25 [2019-11-23 20:36:51,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:51,829 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-23 20:36:51,829 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-23 20:36:51,829 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-23 20:36:51,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-23 20:36:51,830 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:51,830 INFO L410 BasicCegarLoop]: trace histogram [16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:52,037 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:52,038 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:52,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:52,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1541792360, now seen corresponding path program 6 times [2019-11-23 20:36:52,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:52,039 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579920007] [2019-11-23 20:36:52,040 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:52,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-23 20:36:52,194 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579920007] [2019-11-23 20:36:52,195 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877446252] [2019-11-23 20:36:52,195 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 [2019-11-23 20:36:52,474 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-23 20:36:52,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:52,476 INFO L255 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 20:36:52,478 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:52,504 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-23 20:36:52,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:52,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-11-23 20:36:52,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715926226] [2019-11-23 20:36:52,506 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-23 20:36:52,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:52,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-23 20:36:52,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-23 20:36:52,506 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2019-11-23 20:36:52,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:52,624 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2019-11-23 20:36:52,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 20:36:52,624 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2019-11-23 20:36:52,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:52,625 INFO L225 Difference]: With dead ends: 75 [2019-11-23 20:36:52,626 INFO L226 Difference]: Without dead ends: 69 [2019-11-23 20:36:52,626 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-23 20:36:52,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-11-23 20:36:52,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 34. [2019-11-23 20:36:52,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-23 20:36:52,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-11-23 20:36:52,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2019-11-23 20:36:52,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:52,640 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-11-23 20:36:52,640 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-23 20:36:52,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-11-23 20:36:52,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-23 20:36:52,641 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:52,642 INFO L410 BasicCegarLoop]: trace histogram [16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:52,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:52,847 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:52,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:52,847 INFO L82 PathProgramCache]: Analyzing trace with hash -499476750, now seen corresponding path program 7 times [2019-11-23 20:36:52,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:52,847 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889524968] [2019-11-23 20:36:52,848 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:52,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-23 20:36:52,975 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889524968] [2019-11-23 20:36:52,975 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906082709] [2019-11-23 20:36:52,977 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 [2019-11-23 20:36:53,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:53,030 INFO L255 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 20:36:53,032 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:53,167 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-23 20:36:53,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:53,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 19] total 25 [2019-11-23 20:36:53,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699711437] [2019-11-23 20:36:53,169 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-23 20:36:53,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:53,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-23 20:36:53,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2019-11-23 20:36:53,171 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 25 states. [2019-11-23 20:36:53,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:53,370 INFO L93 Difference]: Finished difference Result 96 states and 106 transitions. [2019-11-23 20:36:53,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-23 20:36:53,371 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2019-11-23 20:36:53,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:53,372 INFO L225 Difference]: With dead ends: 96 [2019-11-23 20:36:53,372 INFO L226 Difference]: Without dead ends: 81 [2019-11-23 20:36:53,373 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2019-11-23 20:36:53,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-11-23 20:36:53,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 41. [2019-11-23 20:36:53,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-23 20:36:53,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-11-23 20:36:53,379 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 32 [2019-11-23 20:36:53,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:53,380 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-11-23 20:36:53,380 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-23 20:36:53,380 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-11-23 20:36:53,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-23 20:36:53,381 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:53,381 INFO L410 BasicCegarLoop]: trace histogram [22, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:53,587 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:53,588 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:53,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:53,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1499410168, now seen corresponding path program 8 times [2019-11-23 20:36:53,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:53,589 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171667237] [2019-11-23 20:36:53,589 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:53,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:53,768 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-23 20:36:53,768 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171667237] [2019-11-23 20:36:53,768 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905106175] [2019-11-23 20:36:53,769 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 [2019-11-23 20:36:53,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:36:53,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:53,841 INFO L255 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-23 20:36:53,844 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:54,026 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-23 20:36:54,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:54,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 25] total 31 [2019-11-23 20:36:54,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324567695] [2019-11-23 20:36:54,028 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-23 20:36:54,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:54,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-23 20:36:54,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=466, Unknown=0, NotChecked=0, Total=930 [2019-11-23 20:36:54,029 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 31 states. [2019-11-23 20:36:54,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:54,206 INFO L93 Difference]: Finished difference Result 109 states and 119 transitions. [2019-11-23 20:36:54,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-23 20:36:54,207 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 39 [2019-11-23 20:36:54,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:54,208 INFO L225 Difference]: With dead ends: 109 [2019-11-23 20:36:54,208 INFO L226 Difference]: Without dead ends: 93 [2019-11-23 20:36:54,209 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=464, Invalid=466, Unknown=0, NotChecked=0, Total=930 [2019-11-23 20:36:54,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-11-23 20:36:54,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 48. [2019-11-23 20:36:54,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-23 20:36:54,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-11-23 20:36:54,216 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 39 [2019-11-23 20:36:54,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:54,217 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-11-23 20:36:54,217 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-23 20:36:54,217 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-11-23 20:36:54,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-23 20:36:54,218 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:54,218 INFO L410 BasicCegarLoop]: trace histogram [28, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:54,430 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:54,431 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:54,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:54,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1496885106, now seen corresponding path program 9 times [2019-11-23 20:36:54,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:54,431 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966175723] [2019-11-23 20:36:54,432 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:54,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:54,606 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-11-23 20:36:54,607 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966175723] [2019-11-23 20:36:54,607 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487886826] [2019-11-23 20:36:54,608 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 [2019-11-23 20:36:55,207 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-23 20:36:55,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:55,209 INFO L255 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-23 20:36:55,215 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:55,235 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-11-23 20:36:55,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:55,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-11-23 20:36:55,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824882379] [2019-11-23 20:36:55,236 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 20:36:55,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:55,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 20:36:55,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:36:55,237 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 13 states. [2019-11-23 20:36:55,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:55,336 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2019-11-23 20:36:55,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 20:36:55,336 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-11-23 20:36:55,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:55,337 INFO L225 Difference]: With dead ends: 105 [2019-11-23 20:36:55,337 INFO L226 Difference]: Without dead ends: 99 [2019-11-23 20:36:55,338 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:36:55,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-23 20:36:55,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 49. [2019-11-23 20:36:55,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-23 20:36:55,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2019-11-23 20:36:55,345 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 46 [2019-11-23 20:36:55,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:55,345 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2019-11-23 20:36:55,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 20:36:55,345 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2019-11-23 20:36:55,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-23 20:36:55,346 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:55,346 INFO L410 BasicCegarLoop]: trace histogram [28, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:55,547 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:55,547 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:55,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:55,548 INFO L82 PathProgramCache]: Analyzing trace with hash -789755816, now seen corresponding path program 10 times [2019-11-23 20:36:55,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:55,549 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497301592] [2019-11-23 20:36:55,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:55,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:55,692 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-11-23 20:36:55,692 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497301592] [2019-11-23 20:36:55,692 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19312533] [2019-11-23 20:36:55,693 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 [2019-11-23 20:36:55,778 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:36:55,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:36:55,781 INFO L255 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-23 20:36:55,784 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:36:56,052 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-23 20:36:56,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:36:56,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 31] total 39 [2019-11-23 20:36:56,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318713817] [2019-11-23 20:36:56,053 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-23 20:36:56,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:36:56,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-23 20:36:56,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2019-11-23 20:36:56,055 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 39 states. [2019-11-23 20:36:56,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:36:56,260 INFO L93 Difference]: Finished difference Result 131 states and 143 transitions. [2019-11-23 20:36:56,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-23 20:36:56,260 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 47 [2019-11-23 20:36:56,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:36:56,261 INFO L225 Difference]: With dead ends: 131 [2019-11-23 20:36:56,261 INFO L226 Difference]: Without dead ends: 113 [2019-11-23 20:36:56,263 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2019-11-23 20:36:56,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2019-11-23 20:36:56,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 58. [2019-11-23 20:36:56,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-23 20:36:56,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-11-23 20:36:56,270 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 47 [2019-11-23 20:36:56,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:36:56,270 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-11-23 20:36:56,271 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-23 20:36:56,271 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-11-23 20:36:56,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-23 20:36:56,272 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:36:56,272 INFO L410 BasicCegarLoop]: trace histogram [36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:36:56,479 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:36:56,480 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:36:56,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:36:56,481 INFO L82 PathProgramCache]: Analyzing trace with hash -760158542, now seen corresponding path program 11 times [2019-11-23 20:36:56,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:36:56,482 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693933974] [2019-11-23 20:36:56,482 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:36:56,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:36:56,642 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-11-23 20:36:56,643 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693933974] [2019-11-23 20:36:56,643 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820279861] [2019-11-23 20:36:56,643 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 [2019-11-23 20:38:20,583 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2019-11-23 20:38:20,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:38:20,615 INFO L255 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 38 conjunts are in the unsatisfiable core [2019-11-23 20:38:20,618 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:38:20,933 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-23 20:38:20,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:38:20,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 39] total 46 [2019-11-23 20:38:20,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800347958] [2019-11-23 20:38:20,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-11-23 20:38:20,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:38:20,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-11-23 20:38:20,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1034, Invalid=1036, Unknown=0, NotChecked=0, Total=2070 [2019-11-23 20:38:20,936 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 46 states. [2019-11-23 20:38:21,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:38:21,168 INFO L93 Difference]: Finished difference Result 145 states and 156 transitions. [2019-11-23 20:38:21,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-11-23 20:38:21,168 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 56 [2019-11-23 20:38:21,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:38:21,170 INFO L225 Difference]: With dead ends: 145 [2019-11-23 20:38:21,170 INFO L226 Difference]: Without dead ends: 126 [2019-11-23 20:38:21,172 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1337 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=1034, Invalid=1036, Unknown=0, NotChecked=0, Total=2070 [2019-11-23 20:38:21,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-11-23 20:38:21,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 66. [2019-11-23 20:38:21,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-23 20:38:21,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-11-23 20:38:21,179 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 56 [2019-11-23 20:38:21,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:38:21,179 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-11-23 20:38:21,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-11-23 20:38:21,180 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-11-23 20:38:21,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-23 20:38:21,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:38:21,181 INFO L410 BasicCegarLoop]: trace histogram [43, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:38:21,381 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:38:21,382 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:38:21,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:38:21,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1083826291, now seen corresponding path program 12 times [2019-11-23 20:38:21,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:38:21,383 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712186270] [2019-11-23 20:38:21,384 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:38:21,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:38:21,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-11-23 20:38:21,551 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712186270] [2019-11-23 20:38:21,552 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478303597] [2019-11-23 20:38:21,552 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