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/eca-rers2012/Problem10_label13.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:56:45,327 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:56:45,329 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:56:45,341 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:56:45,341 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:56:45,342 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:56:45,343 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:56:45,345 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:56:45,347 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:56:45,348 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:56:45,349 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:56:45,350 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:56:45,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:56:45,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:56:45,352 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:56:45,355 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:56:45,356 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:56:45,357 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:56:45,361 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:56:45,362 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:56:45,366 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:56:45,367 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:56:45,368 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:56:45,369 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:56:45,375 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:56:45,381 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:56:45,382 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:56:45,383 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:56:45,384 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:56:45,387 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:56:45,387 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:56:45,388 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:56:45,389 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:56:45,389 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:56:45,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:56:45,392 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:56:45,393 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:56:45,413 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:56:45,414 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:56:45,416 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:56:45,416 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:56:45,416 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:56:45,416 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:56:45,416 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:56:45,417 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:56:45,417 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:56:45,417 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:56:45,418 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:56:45,418 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:56:45,418 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:56:45,419 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:56:45,419 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:56:45,419 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:56:45,419 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:56:45,420 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:56:45,420 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:56:45,420 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:56:45,420 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:56:45,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:56:45,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:56:45,421 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:56:45,421 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:56:45,421 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:56:45,422 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:56:45,422 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:56:45,422 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:56:45,691 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:56:45,706 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:56:45,710 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:56:45,711 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:56:45,711 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:56:45,712 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label13.c [2019-10-14 21:56:45,782 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4190b9cd9/217e52a1a0954839aece54ddb9a4d94c/FLAG790f03157 [2019-10-14 21:56:46,334 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:56:46,335 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label13.c [2019-10-14 21:56:46,345 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4190b9cd9/217e52a1a0954839aece54ddb9a4d94c/FLAG790f03157 [2019-10-14 21:56:46,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4190b9cd9/217e52a1a0954839aece54ddb9a4d94c [2019-10-14 21:56:46,669 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:56:46,671 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:56:46,672 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:56:46,672 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:56:46,676 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:56:46,677 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:56:46" (1/1) ... [2019-10-14 21:56:46,680 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71e7d651 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:46, skipping insertion in model container [2019-10-14 21:56:46,680 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:56:46" (1/1) ... [2019-10-14 21:56:46,688 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:56:46,739 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:56:47,255 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:56:47,265 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:56:47,366 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:56:47,390 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:56:47,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47 WrapperNode [2019-10-14 21:56:47,392 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:56:47,393 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:56:47,393 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:56:47,393 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:56:47,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,406 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,459 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,475 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,486 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (1/1) ... [2019-10-14 21:56:47,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:56:47,495 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:56:47,495 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:56:47,495 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:56:47,496 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (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 [2019-10-14 21:56:47,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:56:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:56:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-14 21:56:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:56:47,569 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-14 21:56:47,569 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:56:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:56:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-14 21:56:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:56:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:56:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:56:48,836 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:56:48,836 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-14 21:56:48,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:56:48 BoogieIcfgContainer [2019-10-14 21:56:48,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:56:48,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:56:48,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:56:48,842 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:56:48,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:56:46" (1/3) ... [2019-10-14 21:56:48,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a3becc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:56:48, skipping insertion in model container [2019-10-14 21:56:48,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:56:47" (2/3) ... [2019-10-14 21:56:48,844 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a3becc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:56:48, skipping insertion in model container [2019-10-14 21:56:48,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:56:48" (3/3) ... [2019-10-14 21:56:48,847 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label13.c [2019-10-14 21:56:48,859 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:56:48,867 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:56:48,878 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:56:48,904 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:56:48,904 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:56:48,905 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:56:48,905 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:56:48,906 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:56:48,906 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:56:48,906 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:56:48,907 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:56:48,936 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2019-10-14 21:56:48,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:56:48,945 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:56:48,946 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:56:48,948 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:56:48,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:56:48,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1614181646, now seen corresponding path program 1 times [2019-10-14 21:56:48,962 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:56:48,962 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045359561] [2019-10-14 21:56:48,962 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:48,963 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:48,963 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:56:49,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:49,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:49,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:56:49,345 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045359561] [2019-10-14 21:56:49,346 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:56:49,346 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:56:49,346 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494869718] [2019-10-14 21:56:49,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:56:49,351 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:56:49,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:56:49,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:56:49,370 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 5 states. [2019-10-14 21:56:51,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:56:51,308 INFO L93 Difference]: Finished difference Result 730 states and 1301 transitions. [2019-10-14 21:56:51,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:56:51,310 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 61 [2019-10-14 21:56:51,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:56:51,329 INFO L225 Difference]: With dead ends: 730 [2019-10-14 21:56:51,329 INFO L226 Difference]: Without dead ends: 447 [2019-10-14 21:56:51,337 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:56:51,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2019-10-14 21:56:51,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 441. [2019-10-14 21:56:51,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 441 states. [2019-10-14 21:56:51,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 672 transitions. [2019-10-14 21:56:51,482 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 672 transitions. Word has length 61 [2019-10-14 21:56:51,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:56:51,483 INFO L462 AbstractCegarLoop]: Abstraction has 441 states and 672 transitions. [2019-10-14 21:56:51,483 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:56:51,484 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 672 transitions. [2019-10-14 21:56:51,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-10-14 21:56:51,501 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:56:51,501 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:56:51,502 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:56:51,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:56:51,505 INFO L82 PathProgramCache]: Analyzing trace with hash 562524769, now seen corresponding path program 1 times [2019-10-14 21:56:51,506 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:56:51,506 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501998090] [2019-10-14 21:56:51,506 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:51,506 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:51,507 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:56:51,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:51,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:51,938 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 53 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:56:51,939 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501998090] [2019-10-14 21:56:51,939 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419929351] [2019-10-14 21:56:51,940 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:56:52,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:52,047 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:56:52,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:56:52,197 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:56:52,198 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 21:56:52,198 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2019-10-14 21:56:52,198 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665659737] [2019-10-14 21:56:52,200 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:56:52,201 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:56:52,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:56:52,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:56:52,201 INFO L87 Difference]: Start difference. First operand 441 states and 672 transitions. Second operand 5 states. [2019-10-14 21:56:53,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:56:53,149 INFO L93 Difference]: Finished difference Result 1031 states and 1586 transitions. [2019-10-14 21:56:53,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:56:53,150 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 180 [2019-10-14 21:56:53,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:56:53,154 INFO L225 Difference]: With dead ends: 1031 [2019-10-14 21:56:53,155 INFO L226 Difference]: Without dead ends: 596 [2019-10-14 21:56:53,156 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:56:53,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2019-10-14 21:56:53,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 590. [2019-10-14 21:56:53,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 590 states. [2019-10-14 21:56:53,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 590 states to 590 states and 865 transitions. [2019-10-14 21:56:53,194 INFO L78 Accepts]: Start accepts. Automaton has 590 states and 865 transitions. Word has length 180 [2019-10-14 21:56:53,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:56:53,198 INFO L462 AbstractCegarLoop]: Abstraction has 590 states and 865 transitions. [2019-10-14 21:56:53,198 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:56:53,199 INFO L276 IsEmpty]: Start isEmpty. Operand 590 states and 865 transitions. [2019-10-14 21:56:53,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2019-10-14 21:56:53,205 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:56:53,205 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:56:53,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:56:53,409 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:56:53,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:56:53,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1013955258, now seen corresponding path program 1 times [2019-10-14 21:56:53,411 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:56:53,412 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921079416] [2019-10-14 21:56:53,412 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:53,412 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:53,412 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:56:53,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:53,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:53,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:53,740 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:56:53,741 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921079416] [2019-10-14 21:56:53,741 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:56:53,741 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2019-10-14 21:56:53,741 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727854522] [2019-10-14 21:56:53,742 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:56:53,742 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:56:53,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:56:53,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:56:53,743 INFO L87 Difference]: Start difference. First operand 590 states and 865 transitions. Second operand 9 states. [2019-10-14 21:56:55,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:56:55,736 INFO L93 Difference]: Finished difference Result 1939 states and 3010 transitions. [2019-10-14 21:56:55,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:56:55,737 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 187 [2019-10-14 21:56:55,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:56:55,745 INFO L225 Difference]: With dead ends: 1939 [2019-10-14 21:56:55,745 INFO L226 Difference]: Without dead ends: 1355 [2019-10-14 21:56:55,747 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:56:55,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1355 states. [2019-10-14 21:56:55,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1355 to 894. [2019-10-14 21:56:55,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 894 states. [2019-10-14 21:56:55,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 894 states to 894 states and 1190 transitions. [2019-10-14 21:56:55,788 INFO L78 Accepts]: Start accepts. Automaton has 894 states and 1190 transitions. Word has length 187 [2019-10-14 21:56:55,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:56:55,789 INFO L462 AbstractCegarLoop]: Abstraction has 894 states and 1190 transitions. [2019-10-14 21:56:55,789 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:56:55,789 INFO L276 IsEmpty]: Start isEmpty. Operand 894 states and 1190 transitions. [2019-10-14 21:56:55,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2019-10-14 21:56:55,793 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:56:55,793 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:56:55,793 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:56:55,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:56:55,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1373393371, now seen corresponding path program 1 times [2019-10-14 21:56:55,794 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:56:55,794 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376266243] [2019-10-14 21:56:55,795 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:55,795 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:56:55,795 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:56:55,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:55,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:55,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 175 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:56:56,419 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376266243] [2019-10-14 21:56:56,419 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915049005] [2019-10-14 21:56:56,419 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:56:56,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:56:56,519 INFO L256 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:56:56,534 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:56:56,623 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:56:56,699 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 176 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:56:56,699 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:56:56,699 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 15 [2019-10-14 21:56:56,700 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272721305] [2019-10-14 21:56:56,701 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:56:56,701 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:56:56,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:56:56,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:56:56,702 INFO L87 Difference]: Start difference. First operand 894 states and 1190 transitions. Second operand 15 states. [2019-10-14 21:57:01,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:57:01,217 INFO L93 Difference]: Finished difference Result 2114 states and 2917 transitions. [2019-10-14 21:57:01,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:57:01,218 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 250 [2019-10-14 21:57:01,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:57:01,226 INFO L225 Difference]: With dead ends: 2114 [2019-10-14 21:57:01,227 INFO L226 Difference]: Without dead ends: 1369 [2019-10-14 21:57:01,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 261 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=476, Invalid=1594, Unknown=0, NotChecked=0, Total=2070 [2019-10-14 21:57:01,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1369 states. [2019-10-14 21:57:01,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1369 to 1051. [2019-10-14 21:57:01,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1051 states. [2019-10-14 21:57:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1051 states to 1051 states and 1323 transitions. [2019-10-14 21:57:01,278 INFO L78 Accepts]: Start accepts. Automaton has 1051 states and 1323 transitions. Word has length 250 [2019-10-14 21:57:01,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:57:01,280 INFO L462 AbstractCegarLoop]: Abstraction has 1051 states and 1323 transitions. [2019-10-14 21:57:01,280 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:57:01,280 INFO L276 IsEmpty]: Start isEmpty. Operand 1051 states and 1323 transitions. [2019-10-14 21:57:01,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2019-10-14 21:57:01,290 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:57:01,291 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:57:01,499 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:01,500 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:57:01,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:57:01,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1409344854, now seen corresponding path program 1 times [2019-10-14 21:57:01,501 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:57:01,501 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754447975] [2019-10-14 21:57:01,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:01,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:01,502 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:57:01,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:01,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:01,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:01,811 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 184 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:57:01,812 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754447975] [2019-10-14 21:57:01,812 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569373617] [2019-10-14 21:57:01,812 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:01,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:01,903 INFO L256 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:57:01,907 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:57:02,008 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 185 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:57:02,008 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:57:02,008 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-10-14 21:57:02,009 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426048743] [2019-10-14 21:57:02,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:57:02,010 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:57:02,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:57:02,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:57:02,011 INFO L87 Difference]: Start difference. First operand 1051 states and 1323 transitions. Second operand 11 states. [2019-10-14 21:57:04,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:57:04,932 INFO L93 Difference]: Finished difference Result 3243 states and 4611 transitions. [2019-10-14 21:57:04,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:57:04,933 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 265 [2019-10-14 21:57:04,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:57:04,942 INFO L225 Difference]: With dead ends: 3243 [2019-10-14 21:57:04,942 INFO L226 Difference]: Without dead ends: 1258 [2019-10-14 21:57:04,949 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=112, Invalid=268, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:57:04,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1258 states. [2019-10-14 21:57:04,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1258 to 1228. [2019-10-14 21:57:04,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1228 states. [2019-10-14 21:57:05,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1228 states to 1228 states and 1503 transitions. [2019-10-14 21:57:05,002 INFO L78 Accepts]: Start accepts. Automaton has 1228 states and 1503 transitions. Word has length 265 [2019-10-14 21:57:05,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:57:05,004 INFO L462 AbstractCegarLoop]: Abstraction has 1228 states and 1503 transitions. [2019-10-14 21:57:05,005 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:57:05,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1228 states and 1503 transitions. [2019-10-14 21:57:05,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2019-10-14 21:57:05,012 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:57:05,012 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:57:05,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:05,217 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:57:05,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:57:05,217 INFO L82 PathProgramCache]: Analyzing trace with hash -73832098, now seen corresponding path program 1 times [2019-10-14 21:57:05,218 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:57:05,218 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907320493] [2019-10-14 21:57:05,218 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:05,218 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:05,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:57:05,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:05,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:05,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:05,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:05,587 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 108 proven. 90 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 21:57:05,588 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907320493] [2019-10-14 21:57:05,588 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933018948] [2019-10-14 21:57:05,588 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:05,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:05,721 INFO L256 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:57:05,724 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:57:05,852 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:57:05,853 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 21:57:05,854 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 11 [2019-10-14 21:57:05,854 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532274180] [2019-10-14 21:57:05,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:57:05,856 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:57:05,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:57:05,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:57:05,856 INFO L87 Difference]: Start difference. First operand 1228 states and 1503 transitions. Second operand 5 states. [2019-10-14 21:57:06,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:57:06,607 INFO L93 Difference]: Finished difference Result 2281 states and 2775 transitions. [2019-10-14 21:57:06,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:57:06,608 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 275 [2019-10-14 21:57:06,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:57:06,613 INFO L225 Difference]: With dead ends: 2281 [2019-10-14 21:57:06,614 INFO L226 Difference]: Without dead ends: 1218 [2019-10-14 21:57:06,617 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 275 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:57:06,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1218 states. [2019-10-14 21:57:06,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1218 to 1196. [2019-10-14 21:57:06,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1196 states. [2019-10-14 21:57:06,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1196 states to 1196 states and 1370 transitions. [2019-10-14 21:57:06,646 INFO L78 Accepts]: Start accepts. Automaton has 1196 states and 1370 transitions. Word has length 275 [2019-10-14 21:57:06,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:57:06,647 INFO L462 AbstractCegarLoop]: Abstraction has 1196 states and 1370 transitions. [2019-10-14 21:57:06,647 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:57:06,647 INFO L276 IsEmpty]: Start isEmpty. Operand 1196 states and 1370 transitions. [2019-10-14 21:57:06,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2019-10-14 21:57:06,654 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:57:06,655 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:57:06,866 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:06,867 INFO L410 AbstractCegarLoop]: === Iteration 7 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:57:06,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:57:06,867 INFO L82 PathProgramCache]: Analyzing trace with hash -467387859, now seen corresponding path program 1 times [2019-10-14 21:57:06,868 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:57:06,868 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495077863] [2019-10-14 21:57:06,868 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:06,868 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:57:06,868 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:57:06,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:07,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:07,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:07,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:07,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:08,179 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 293 proven. 65 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2019-10-14 21:57:08,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495077863] [2019-10-14 21:57:08,179 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369453168] [2019-10-14 21:57:08,179 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:57:08,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:57:08,286 INFO L256 TraceCheckSpWp]: Trace formula consists of 581 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:57:08,301 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:57:08,350 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,351 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,351 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,353 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,354 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,356 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,356 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:08,357 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:20,606 WARN L191 SmtUtils]: Spent 12.13 s on a formula simplification. DAG size of input: 49 DAG size of output: 36 [2019-10-14 21:57:20,663 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-10-14 21:57:20,765 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:57:20,903 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 374 proven. 2 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:57:20,903 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:57:20,903 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8] total 24 [2019-10-14 21:57:20,904 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399778157] [2019-10-14 21:57:20,905 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:57:20,905 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:57:20,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:57:20,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:57:20,906 INFO L87 Difference]: Start difference. First operand 1196 states and 1370 transitions. Second operand 24 states.