/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:44:38,867 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:44:38,869 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:44:38,883 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:44:38,883 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:44:38,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:44:38,886 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:44:38,888 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:44:38,891 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:44:38,892 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:44:38,893 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:44:38,894 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:44:38,895 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:44:38,896 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:44:38,897 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:44:38,899 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:44:38,900 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:44:38,901 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:44:38,903 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:44:38,905 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:44:38,907 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:44:38,908 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:44:38,910 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:44:38,911 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:44:38,914 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:44:38,925 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:44:38,926 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:44:38,927 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:44:38,929 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 [2020-07-21 10:44:38,956 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:44:38,957 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:44:38,959 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:44:38,959 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:44:38,960 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:44:38,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:44:38,960 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:44:38,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:44:38,961 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:44:38,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:44:38,961 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:44:38,963 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:44:38,963 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:44:38,963 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:44:38,963 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:44:38,964 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:44:38,964 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:44:38,964 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:44:38,965 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:44:38,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:44:38,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:44:38,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:44:38,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:44:38,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:44:38,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:44:38,967 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:44:38,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:38,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:44:38,968 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:44:38,968 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 10:44:39,281 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:44:39,296 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:44:39,299 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:44:39,301 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:44:39,301 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:44:39,302 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-21 10:44:39,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd0356f29/5bb41a1edb4b4f0fb14ff1ec60fccc82/FLAGa5e2d0a5e [2020-07-21 10:44:39,889 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:44:39,890 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-1.c [2020-07-21 10:44:39,898 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd0356f29/5bb41a1edb4b4f0fb14ff1ec60fccc82/FLAGa5e2d0a5e [2020-07-21 10:44:40,277 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd0356f29/5bb41a1edb4b4f0fb14ff1ec60fccc82 [2020-07-21 10:44:40,291 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:44:40,295 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:44:40,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:44:40,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:44:40,307 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:44:40,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fca7f3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40, skipping insertion in model container [2020-07-21 10:44:40,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,320 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:44:40,335 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:44:40,499 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:44:40,504 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:44:40,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:44:40,530 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:44:40,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40 WrapperNode [2020-07-21 10:44:40,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:44:40,532 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:44:40,532 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:44:40,532 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:44:40,546 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,546 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,551 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,552 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,555 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (1/1) ... [2020-07-21 10:44:40,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:44:40,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:44:40,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:44:40,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:44:40,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (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 [2020-07-21 10:44:40,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:44:40,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:44:40,722 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 10:44:40,722 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:44:40,722 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:44:40,723 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:44:40,723 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 10:44:40,723 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:44:40,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:44:40,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:44:40,914 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:44:40,914 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:44:40,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:44:40 BoogieIcfgContainer [2020-07-21 10:44:40,919 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:44:40,920 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:44:40,920 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:44:40,923 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:44:40,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:44:40" (1/3) ... [2020-07-21 10:44:40,924 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ac13d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:44:40, skipping insertion in model container [2020-07-21 10:44:40,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:40" (2/3) ... [2020-07-21 10:44:40,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ac13d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:44:40, skipping insertion in model container [2020-07-21 10:44:40,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:44:40" (3/3) ... [2020-07-21 10:44:40,927 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-1.c [2020-07-21 10:44:40,936 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:44:40,945 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:44:40,961 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:44:40,990 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:44:40,990 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:44:40,990 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:44:40,990 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:44:40,991 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:44:40,991 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:44:40,991 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:44:40,991 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:44:41,012 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 10:44:41,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:44:41,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:41,021 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:41,022 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:41,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:41,028 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 10:44:41,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:41,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922651457] [2020-07-21 10:44:41,036 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:41,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:41,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:44:41,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:41,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:44:41,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:44:41,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922651457] [2020-07-21 10:44:41,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:44:41,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:44:41,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604860307] [2020-07-21 10:44:41,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:44:41,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:41,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:44:41,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:44:41,281 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 10:44:41,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:41,402 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 10:44:41,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:44:41,405 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:44:41,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:41,418 INFO L225 Difference]: With dead ends: 35 [2020-07-21 10:44:41,418 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 10:44:41,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:44:41,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 10:44:41,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 10:44:41,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:44:41,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:44:41,479 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 10:44:41,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:41,480 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:44:41,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:44:41,480 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:44:41,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:44:41,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:41,483 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:41,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:41,697 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:41,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:41,698 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 10:44:41,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:41,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459634349] [2020-07-21 10:44:41,700 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:41,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:41,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:44:41,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:41,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:44:41,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:44:41,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459634349] [2020-07-21 10:44:41,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:44:41,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:44:41,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035769803] [2020-07-21 10:44:41,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:44:41,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:41,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:44:41,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:44:41,773 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 10:44:41,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:41,869 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 10:44:41,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:44:41,870 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:44:41,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:41,871 INFO L225 Difference]: With dead ends: 27 [2020-07-21 10:44:41,872 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 10:44:41,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:44:41,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 10:44:41,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 10:44:41,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:44:41,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:44:41,882 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 10:44:41,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:41,883 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:44:41,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:44:41,883 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:44:41,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:44:41,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:41,885 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:42,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,100 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:42,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:42,101 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 10:44:42,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:42,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300315174] [2020-07-21 10:44:42,103 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:42,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:44:42,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:42,225 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:44:42,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:42,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:42,536 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:44:42,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300315174] [2020-07-21 10:44:42,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:42,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:44:42,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602888940] [2020-07-21 10:44:42,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:44:42,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:42,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:44:42,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:44:42,540 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 10:44:42,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:42,695 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 10:44:42,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:44:42,697 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:44:42,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:42,699 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:44:42,699 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:44:42,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:42,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:44:42,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 10:44:42,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:44:42,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:44:42,721 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 10:44:42,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:42,722 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:44:42,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:44:42,722 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:44:42,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:44:42,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:42,727 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:42,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,942 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:42,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:42,943 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 10:44:42,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:42,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671758390] [2020-07-21 10:44:42,944 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:42,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:44:42,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:43,019 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 10:44:43,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:43,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:43,209 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:44:43,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671758390] [2020-07-21 10:44:43,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:43,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:44:43,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444361464] [2020-07-21 10:44:43,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:44:43,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:43,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:44:43,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:44:43,215 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 10:44:43,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:43,340 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 10:44:43,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:44:43,342 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 10:44:43,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:43,345 INFO L225 Difference]: With dead ends: 37 [2020-07-21 10:44:43,345 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 10:44:43,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:43,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 10:44:43,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 10:44:43,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:44:43,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:44:43,364 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 10:44:43,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:43,365 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:44:43,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:44:43,365 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:44:43,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:44:43,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:43,367 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:43,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:43,583 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:43,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:43,584 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 10:44:43,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:43,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36021026] [2020-07-21 10:44:43,584 INFO L95 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:43,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:43,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:44:43,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:43,663 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 10:44:43,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:43,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:43,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:43,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:43,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:44:44,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36021026] [2020-07-21 10:44:44,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:44,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:44:44,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075700198] [2020-07-21 10:44:44,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:44:44,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:44,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:44:44,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:44,028 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 10:44:44,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:44,219 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 10:44:44,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:44:44,220 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 10:44:44,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:44,224 INFO L225 Difference]: With dead ends: 42 [2020-07-21 10:44:44,224 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 10:44:44,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:44:44,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 10:44:44,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 10:44:44,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:44:44,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:44:44,241 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 10:44:44,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:44,243 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:44:44,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:44:44,243 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:44:44,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 10:44:44,251 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:44,251 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:44,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:44,470 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:44,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:44,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 10:44:44,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:44,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994880081] [2020-07-21 10:44:44,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:44,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:44,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:44:44,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:44,545 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 10:44:44,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:44,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,847 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:44:44,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994880081] [2020-07-21 10:44:44,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:44,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:44:44,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661348350] [2020-07-21 10:44:44,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:44:44,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:44,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:44:44,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:44,850 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 10:44:44,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:44,966 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 10:44:44,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:44:44,966 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 10:44:44,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:44,969 INFO L225 Difference]: With dead ends: 47 [2020-07-21 10:44:44,969 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 10:44:44,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:44:44,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 10:44:44,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 10:44:44,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:44:44,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:44:44,980 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 10:44:44,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:44,981 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:44:44,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:44:44,981 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:44:44,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 10:44:44,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:44,984 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:45,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:45,188 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:45,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:45,189 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 10:44:45,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:45,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314661881] [2020-07-21 10:44:45,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:45,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:45,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:44:45,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:45,291 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 10:44:45,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:45,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:45,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:45,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:45,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:45,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:45,878 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 10:44:45,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314661881] [2020-07-21 10:44:45,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:45,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:44:45,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752195576] [2020-07-21 10:44:45,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:44:45,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:45,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:44:45,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:44:45,882 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 10:44:46,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:46,079 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 10:44:46,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:44:46,080 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 10:44:46,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:46,089 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:44:46,089 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 10:44:46,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:46,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 10:44:46,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 10:44:46,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:44:46,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:44:46,118 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 10:44:46,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:46,118 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:44:46,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:44:46,119 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:44:46,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 10:44:46,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:46,125 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:46,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:46,327 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:46,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:46,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 10:44:46,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:46,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601005898] [2020-07-21 10:44:46,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:46,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:46,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:44:46,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:46,458 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 10:44:46,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:46,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,086 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 10:44:47,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601005898] [2020-07-21 10:44:47,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:47,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:44:47,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426239488] [2020-07-21 10:44:47,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:44:47,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:47,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:44:47,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:44:47,089 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 10:44:47,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:47,238 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 10:44:47,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:44:47,239 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 10:44:47,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:47,241 INFO L225 Difference]: With dead ends: 57 [2020-07-21 10:44:47,241 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 10:44:47,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:47,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 10:44:47,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 10:44:47,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:44:47,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:44:47,255 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 10:44:47,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:47,256 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:44:47,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:44:47,257 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:44:47,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 10:44:47,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:47,259 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:47,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:47,474 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:47,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:47,474 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 10:44:47,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:47,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2568197] [2020-07-21 10:44:47,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:47,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:47,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:44:47,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:47,645 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 10:44:47,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:48,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 10:44:48,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2568197] [2020-07-21 10:44:48,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:48,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:44:48,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526074743] [2020-07-21 10:44:48,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:44:48,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:48,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:44:48,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:44:48,632 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 10:44:48,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:48,954 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 10:44:48,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:44:48,958 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 10:44:48,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:48,964 INFO L225 Difference]: With dead ends: 62 [2020-07-21 10:44:48,964 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 10:44:48,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:44:48,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 10:44:48,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 10:44:48,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:44:48,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:44:48,978 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 10:44:48,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:48,979 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:44:48,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:44:48,979 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:44:48,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 10:44:48,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:48,982 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:49,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:49,196 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:49,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:49,197 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 10:44:49,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:49,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838682016] [2020-07-21 10:44:49,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:49,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:49,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:44:49,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:49,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 10:44:49,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:50,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 10:44:50,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838682016] [2020-07-21 10:44:50,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:50,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:44:50,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158264177] [2020-07-21 10:44:50,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:44:50,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:50,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:44:50,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:44:50,567 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 10:44:50,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:50,739 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 10:44:50,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:44:50,740 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 10:44:50,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:50,743 INFO L225 Difference]: With dead ends: 67 [2020-07-21 10:44:50,744 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 10:44:50,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:44:50,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 10:44:50,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 10:44:50,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:44:50,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:44:50,756 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 10:44:50,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:50,757 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:44:50,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:44:50,758 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:44:50,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 10:44:50,762 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:50,762 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:50,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:50,976 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:50,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:50,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 10:44:50,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:50,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899217320] [2020-07-21 10:44:50,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:51,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:51,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:44:51,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:51,195 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 10:44:51,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:52,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:53,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:53,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 10:44:53,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899217320] [2020-07-21 10:44:53,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:53,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:53,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036692446] [2020-07-21 10:44:53,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:53,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:53,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:53,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:53,120 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 10:44:53,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:53,374 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 10:44:53,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:53,375 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 10:44:53,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:53,379 INFO L225 Difference]: With dead ends: 72 [2020-07-21 10:44:53,380 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 10:44:53,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:53,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 10:44:53,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 10:44:53,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:53,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:53,417 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 10:44:53,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:53,421 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:53,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:53,421 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:53,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 10:44:53,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:53,430 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:53,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:53,646 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:53,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:53,647 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 10:44:53,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:53,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952880335] [2020-07-21 10:44:53,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:53,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:53,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:44:53,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:53,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 10:44:53,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:55,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 10:44:55,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952880335] [2020-07-21 10:44:55,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:55,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:55,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688372281] [2020-07-21 10:44:55,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:55,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:55,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:55,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:55,896 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 10:44:56,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:56,105 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 10:44:56,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:56,106 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 10:44:56,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:56,113 INFO L225 Difference]: With dead ends: 77 [2020-07-21 10:44:56,113 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 10:44:56,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:56,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 10:44:56,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 10:44:56,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:56,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:56,136 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 10:44:56,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:56,138 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:56,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:56,138 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:56,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 10:44:56,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:56,154 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:56,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:56,368 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:56,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:56,369 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 10:44:56,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:56,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781607804] [2020-07-21 10:44:56,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:56,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:56,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:44:56,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:56,755 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 10:44:56,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:58,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 10:45:00,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781607804] [2020-07-21 10:45:00,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:00,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:45:00,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907084067] [2020-07-21 10:45:00,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:45:00,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:00,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:45:00,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:45:00,183 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 10:45:00,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:00,642 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 10:45:00,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:45:00,643 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 10:45:00,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:00,653 INFO L225 Difference]: With dead ends: 82 [2020-07-21 10:45:00,653 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 10:45:00,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:45:00,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 10:45:00,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 10:45:00,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:45:00,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:45:00,674 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 10:45:00,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:00,677 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:45:00,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:45:00,677 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:45:00,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 10:45:00,680 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:00,681 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:00,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:00,896 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:00,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:00,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 10:45:00,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:00,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928877298] [2020-07-21 10:45:00,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:01,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:01,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:45:01,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:01,282 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 10:45:01,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:03,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:03,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:03,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,486 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 10:45:04,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928877298] [2020-07-21 10:45:04,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:04,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:45:04,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731255055] [2020-07-21 10:45:04,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:45:04,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:04,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:45:04,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:45:04,489 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 10:45:04,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:04,775 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 10:45:04,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:45:04,776 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 10:45:04,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:04,779 INFO L225 Difference]: With dead ends: 87 [2020-07-21 10:45:04,780 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 10:45:04,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:45:04,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 10:45:04,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 10:45:04,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:45:04,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:45:04,810 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 10:45:04,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:04,811 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:45:04,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:45:04,811 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:45:04,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 10:45:04,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:04,823 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:05,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:05,042 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:05,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:05,043 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 10:45:05,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:05,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451465719] [2020-07-21 10:45:05,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:05,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:05,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 2380 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:45:05,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:06,105 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 10:45:06,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:09,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:11,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:11,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:11,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,876 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 10:45:12,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451465719] [2020-07-21 10:45:12,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:12,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:12,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935460912] [2020-07-21 10:45:12,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:12,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:12,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:12,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:12,880 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 10:45:13,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:13,631 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 10:45:13,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:13,632 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 10:45:13,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:13,637 INFO L225 Difference]: With dead ends: 92 [2020-07-21 10:45:13,638 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 10:45:13,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:45:13,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 10:45:13,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 10:45:13,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:13,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:13,654 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 10:45:13,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:13,657 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:13,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:13,657 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:13,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-21 10:45:13,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:13,664 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 84, 50, 50, 50, 50, 50, 50, 50, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:13,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:13,879 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:13,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:13,880 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-21 10:45:13,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:13,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118275873] [2020-07-21 10:45:13,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:14,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:14,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 1549 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:45:14,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:14,592 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3626 refuted. 0 times theorem prover too weak. 24423 trivial. 0 not checked. [2020-07-21 10:45:14,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:17,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:17,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:18,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:18,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:18,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,994 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3703 refuted. 0 times theorem prover too weak. 24346 trivial. 0 not checked. [2020-07-21 10:45:19,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118275873] [2020-07-21 10:45:19,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:19,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:19,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722866133] [2020-07-21 10:45:19,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:19,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:19,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:20,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:20,000 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 10:45:20,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:20,726 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 10:45:20,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:20,730 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-21 10:45:20,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:20,734 INFO L225 Difference]: With dead ends: 97 [2020-07-21 10:45:20,734 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 10:45:20,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1401 GetRequests, 1358 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:45:20,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 10:45:20,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 10:45:20,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:20,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:20,749 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-21 10:45:20,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:20,750 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:20,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:20,750 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:20,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 10:45:20,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:20,779 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:20,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:20,994 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:20,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:20,995 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-21 10:45:20,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:20,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847787283] [2020-07-21 10:45:20,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:21,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:21,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 4352 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:21,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:23,144 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11715 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 10:45:23,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:28,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:31,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:36,110 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11807 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 10:45:36,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847787283] [2020-07-21 10:45:36,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:36,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:45:36,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182462322] [2020-07-21 10:45:36,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:45:36,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:36,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:45:36,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:36,114 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 10:45:36,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:36,591 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 10:45:36,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:45:36,592 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 10:45:36,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:36,600 INFO L225 Difference]: With dead ends: 102 [2020-07-21 10:45:36,600 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 10:45:36,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:45:36,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 10:45:36,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 10:45:36,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:45:36,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:45:36,619 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 10:45:36,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:36,623 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:45:36,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:45:36,623 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:45:36,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-21 10:45:36,648 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:36,648 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 164, 98, 98, 98, 98, 98, 98, 98, 66, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:36,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:36,914 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:36,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:36,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-21 10:45:36,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:36,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097678253] [2020-07-21 10:45:36,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:37,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:37,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 3005 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:37,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:38,431 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8306 refuted. 0 times theorem prover too weak. 100095 trivial. 0 not checked. [2020-07-21 10:45:38,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:42,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:45,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:45,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:46,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:46,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:46,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:47,981 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8406 refuted. 0 times theorem prover too weak. 99995 trivial. 0 not checked. [2020-07-21 10:45:47,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1097678253] [2020-07-21 10:45:47,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:47,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:45:47,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977004937] [2020-07-21 10:45:47,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:45:47,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:47,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:45:47,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:47,985 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 10:45:48,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:48,534 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 10:45:48,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:45:48,535 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-21 10:45:48,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:48,540 INFO L225 Difference]: With dead ends: 107 [2020-07-21 10:45:48,540 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 10:45:48,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:45:48,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 10:45:48,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 10:45:48,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:45:48,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:45:48,556 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-21 10:45:48,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:48,557 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:45:48,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:45:48,557 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:45:48,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-21 10:45:48,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:48,605 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:48,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:48,806 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:48,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:48,808 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-21 10:45:48,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:48,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31937799] [2020-07-21 10:45:48,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:49,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:49,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 6092 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:45:49,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:53,199 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-21 10:45:53,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:01,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:06,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:08,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:09,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:09,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:13,828 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-21 10:46:13,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31937799] [2020-07-21 10:46:13,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:13,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:13,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791967272] [2020-07-21 10:46:13,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:13,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:13,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:13,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:13,833 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 10:46:14,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:14,754 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 10:46:14,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:14,755 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-21 10:46:14,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:14,762 INFO L225 Difference]: With dead ends: 112 [2020-07-21 10:46:14,763 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 10:46:14,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:14,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 10:46:14,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 10:46:14,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:14,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:14,780 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-21 10:46:14,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:14,782 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:14,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:14,783 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:14,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2536 [2020-07-21 10:46:14,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:14,830 INFO L422 BasicCegarLoop]: trace histogram [371, 371, 302, 185, 185, 185, 185, 185, 185, 185, 117, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:15,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:15,042 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:15,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:15,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1256486072, now seen corresponding path program 9 times [2020-07-21 10:46:15,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:15,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198018805] [2020-07-21 10:46:15,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:16,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:16,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 5630 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:46:16,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:18,339 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17788 refuted. 0 times theorem prover too weak. 367787 trivial. 0 not checked. [2020-07-21 10:46:18,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:26,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:30,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:33,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:33,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:34,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:34,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:35,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:37,590 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17914 refuted. 0 times theorem prover too weak. 367661 trivial. 0 not checked. [2020-07-21 10:46:37,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198018805] [2020-07-21 10:46:37,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:37,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:37,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248487165] [2020-07-21 10:46:37,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:37,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:37,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:37,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:37,594 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 10:46:38,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:38,597 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 10:46:38,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:38,598 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2535 [2020-07-21 10:46:38,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:38,605 INFO L225 Difference]: With dead ends: 117 [2020-07-21 10:46:38,605 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 10:46:38,607 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5079 GetRequests, 5026 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:38,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 10:46:38,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 10:46:38,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:38,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:38,626 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2535 [2020-07-21 10:46:38,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:38,628 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:38,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:38,628 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:38,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4720 [2020-07-21 10:46:38,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:38,745 INFO L422 BasicCegarLoop]: trace histogram [725, 725, 363, 362, 362, 362, 362, 362, 362, 362, 362, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:38,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:38,946 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:38,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:38,949 INFO L82 PathProgramCache]: Analyzing trace with hash 668131987, now seen corresponding path program 10 times [2020-07-21 10:46:38,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:38,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448468486] [2020-07-21 10:46:38,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:40,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:40,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 10529 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:46:40,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 36919 refuted. 0 times theorem prover too weak. 1335098 trivial. 0 not checked. [2020-07-21 10:46:47,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:47:06,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:06,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:14,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:17,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:19,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:20,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:21,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:21,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:22,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:22,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:22,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:22,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:29,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 37064 refuted. 0 times theorem prover too weak. 1334953 trivial. 0 not checked. [2020-07-21 10:47:29,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448468486] [2020-07-21 10:47:29,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:47:29,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:47:29,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182056081] [2020-07-21 10:47:29,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:47:29,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:47:29,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:47:29,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:47:29,713 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 10:47:31,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:47:31,150 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 10:47:31,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:47:31,151 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4719 [2020-07-21 10:47:31,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:47:31,166 INFO L225 Difference]: With dead ends: 122 [2020-07-21 10:47:31,166 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 10:47:31,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9449 GetRequests, 9391 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:47:31,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 10:47:31,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 10:47:31,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:47:31,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:47:31,195 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4719 [2020-07-21 10:47:31,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:47:31,202 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:47:31,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:47:31,202 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:47:31,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7035 [2020-07-21 10:47:31,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:47:31,594 INFO L422 BasicCegarLoop]: trace histogram [1033, 1033, 829, 516, 516, 516, 516, 516, 516, 516, 313, 204, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:47:31,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:31,795 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:47:31,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:47:31,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1610110729, now seen corresponding path program 10 times [2020-07-21 10:47:31,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:47:31,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098895089] [2020-07-21 10:47:31,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:34,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:47:34,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 15621 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:47:34,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:47:50,296 INFO L134 CoverageAnalysis]: Checked inductivity of 3006798 backedges. 6917 proven. 56292 refuted. 0 times theorem prover too weak. 2943589 trivial. 0 not checked. [2020-07-21 10:47:50,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:48:16,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:28,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:28,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:33,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:33,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:36,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:36,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:38,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:38,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:39,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:39,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:40,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:55,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3006798 backedges. 6917 proven. 56447 refuted. 0 times theorem prover too weak. 2943434 trivial. 0 not checked. [2020-07-21 10:48:55,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098895089] [2020-07-21 10:48:55,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:48:55,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:48:55,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136341821] [2020-07-21 10:48:55,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:48:55,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:48:55,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:48:55,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:48:55,354 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 10:48:56,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:48:56,367 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 10:48:56,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:48:56,372 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7034 [2020-07-21 10:48:56,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:48:56,381 INFO L225 Difference]: With dead ends: 127 [2020-07-21 10:48:56,381 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 10:48:56,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14078 GetRequests, 14020 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:48:56,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 10:48:56,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 10:48:56,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:48:56,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:48:56,409 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7034 [2020-07-21 10:48:56,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:48:56,414 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:48:56,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:48:56,414 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:48:57,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8763 [2020-07-21 10:48:57,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:48:57,057 INFO L422 BasicCegarLoop]: trace histogram [1347, 1347, 674, 673, 673, 673, 673, 673, 673, 673, 673, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:48:57,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:57,273 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:48:57,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:48:57,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1910946654, now seen corresponding path program 11 times [2020-07-21 10:48:57,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:48:57,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576230408] [2020-07-21 10:48:57,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:49:00,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:49:00,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 19548 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:49:00,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:49:23,158 INFO L134 CoverageAnalysis]: Checked inductivity of 4756764 backedges. 8790 proven. 75977 refuted. 0 times theorem prover too weak. 4671997 trivial. 0 not checked. [2020-07-21 10:49:23,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:50:01,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:14,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:20,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:20,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:26,921 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 10:50:26,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:26,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:29,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:31,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:31,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:32,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:33,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:57,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4756764 backedges. 8790 proven. 76153 refuted. 0 times theorem prover too weak. 4671821 trivial. 0 not checked. [2020-07-21 10:50:57,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576230408] [2020-07-21 10:50:57,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:50:57,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:50:57,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097216685] [2020-07-21 10:50:57,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:50:57,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:50:57,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:50:57,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:50:57,257 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 10:50:58,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:50:58,561 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 10:50:58,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:50:58,562 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8762 [2020-07-21 10:50:58,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:50:58,572 INFO L225 Difference]: With dead ends: 132 [2020-07-21 10:50:58,572 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 10:50:58,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17536 GetRequests, 17473 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:50:58,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 10:50:58,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 10:50:58,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:50:58,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:50:58,595 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8762 [2020-07-21 10:50:58,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:50:58,600 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:50:58,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:50:58,601 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:51:00,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11811 [2020-07-21 10:51:00,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:51:00,084 INFO L422 BasicCegarLoop]: trace histogram [1739, 1739, 1369, 869, 869, 869, 869, 869, 869, 869, 500, 370, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:51:00,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:00,285 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:51:00,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:51:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash -404366706, now seen corresponding path program 11 times [2020-07-21 10:51:00,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:51:00,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434653878] [2020-07-21 10:51:00,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:04,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:51:04,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 26232 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:51:04,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:51:44,183 INFO L134 CoverageAnalysis]: Checked inductivity of 8489744 backedges. 10666 proven. 105839 refuted. 0 times theorem prover too weak. 8373239 trivial. 0 not checked. [2020-07-21 10:51:44,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:52:26,413 WARN L193 SmtUtils]: Spent 974.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:52:43,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:43,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:17,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:17,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:22,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:22,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:25,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:25,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:27,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:27,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:28,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:28,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:29,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:29,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:29,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:29,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:29,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:08,543 INFO L134 CoverageAnalysis]: Checked inductivity of 8489744 backedges. 10666 proven. 106026 refuted. 0 times theorem prover too weak. 8373052 trivial. 0 not checked. [2020-07-21 10:54:08,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434653878] [2020-07-21 10:54:08,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:54:08,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:54:08,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019520930] [2020-07-21 10:54:08,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:54:08,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:54:08,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:54:08,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:54:08,551 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 10:54:10,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:54:10,051 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 10:54:10,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:54:10,053 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11810 [2020-07-21 10:54:10,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:54:10,064 INFO L225 Difference]: With dead ends: 137 [2020-07-21 10:54:10,064 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 10:54:10,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23631 GetRequests, 23568 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:54:10,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 10:54:10,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 10:54:10,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:54:10,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:54:10,089 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11810 [2020-07-21 10:54:10,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:54:10,095 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:54:10,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:54:10,095 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:54:11,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10531 [2020-07-21 10:54:11,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:54:11,049 INFO L422 BasicCegarLoop]: trace histogram [1619, 1619, 810, 809, 809, 809, 809, 809, 809, 809, 809, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:54:11,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:54:11,264 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:54:11,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:54:11,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1479633186, now seen corresponding path program 12 times [2020-07-21 10:54:11,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:54:11,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811916219] [2020-07-21 10:54:11,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:54:15,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:54:15,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 23492 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:54:15,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:54:46,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6873264 backedges. 11169 proven. 99639 refuted. 0 times theorem prover too weak. 6762456 trivial. 0 not checked. [2020-07-21 10:54:46,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:54:57,423 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:54:57,528 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 10:55:34,520 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 10:55:42,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:12,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:12,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:25,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:25,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:31,892 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 10:56:33,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:37,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:41,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:43,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:44,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:44,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:44,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:44,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:45,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:45,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:17,033 INFO L134 CoverageAnalysis]: Checked inductivity of 6873264 backedges. 11169 proven. 99849 refuted. 0 times theorem prover too weak. 6762246 trivial. 0 not checked. [2020-07-21 10:57:17,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811916219] [2020-07-21 10:57:17,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:57:17,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 10:57:17,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915138355] [2020-07-21 10:57:17,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 10:57:17,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:57:17,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 10:57:17,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 10:57:17,040 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 10:57:19,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:57:19,644 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 10:57:19,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 10:57:19,647 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 10530 [2020-07-21 10:57:19,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:57:19,657 INFO L225 Difference]: With dead ends: 142 [2020-07-21 10:57:19,658 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 10:57:19,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21073 GetRequests, 21005 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 10:57:19,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 10:57:19,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 10:57:19,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 10:57:19,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 10:57:19,684 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 10530 [2020-07-21 10:57:19,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:57:19,689 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 10:57:19,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 10:57:19,689 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 10:57:20,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11840 [2020-07-21 10:57:20,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:20,296 INFO L422 BasicCegarLoop]: trace histogram [1737, 1737, 1410, 868, 868, 868, 868, 868, 868, 868, 542, 327, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:57:20,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:20,503 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:20,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:20,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1713368815, now seen corresponding path program 12 times [2020-07-21 10:57:20,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:20,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135350070] [2020-07-21 10:57:20,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:24,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:24,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 26287 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:57:24,726 INFO L286 TraceCheckSpWp]: Computing forward predicates...