/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_7-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:13:40,002 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:13:40,005 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:13:40,024 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:13:40,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:13:40,026 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:13:40,028 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:13:40,031 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:13:40,034 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:13:40,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:13:40,038 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:13:40,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:13:40,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:13:40,042 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:13:40,044 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:13:40,046 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:13:40,048 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:13:40,049 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:13:40,052 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:13:40,056 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:13:40,058 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:13:40,060 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:13:40,062 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:13:40,064 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:13:40,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:13:40,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:13:40,087 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:13:40,088 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:13:40,089 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 [2020-07-20 11:13:40,112 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:13:40,112 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:13:40,114 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:13:40,115 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:13:40,115 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:13:40,115 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:13:40,115 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:13:40,116 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:13:40,116 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:13:40,116 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:13:40,116 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:13:40,116 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:13:40,117 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:13:40,117 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:13:40,117 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:13:40,117 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:13:40,117 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:13:40,118 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:13:40,118 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:13:40,118 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:13:40,119 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:13:40,119 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:13:40,119 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:13:40,119 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:13:40,119 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:13:40,120 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:13:40,120 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:40,120 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:13:40,120 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:13:40,120 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 [2020-07-20 11:13:40,516 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:13:40,542 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:13:40,548 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:13:40,551 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:13:40,552 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:13:40,555 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-20 11:13:40,678 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a6a3cdaa/25f31ae1a2434edf88c2a018563fda25/FLAG7238dc4c5 [2020-07-20 11:13:41,359 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:13:41,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-1.c [2020-07-20 11:13:41,376 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a6a3cdaa/25f31ae1a2434edf88c2a018563fda25/FLAG7238dc4c5 [2020-07-20 11:13:41,642 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a6a3cdaa/25f31ae1a2434edf88c2a018563fda25 [2020-07-20 11:13:41,656 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:13:41,661 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:13:41,663 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:13:41,663 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:13:41,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:13:41,671 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:13:41" (1/1) ... [2020-07-20 11:13:41,679 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bfafbe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:41, skipping insertion in model container [2020-07-20 11:13:41,680 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:13:41" (1/1) ... [2020-07-20 11:13:41,692 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:13:41,723 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:13:42,022 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:13:42,040 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:13:42,074 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:13:42,102 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:13:42,103 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42 WrapperNode [2020-07-20 11:13:42,104 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:13:42,106 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:13:42,106 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:13:42,106 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:13:42,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,149 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,150 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,158 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,164 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (1/1) ... [2020-07-20 11:13:42,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:13:42,171 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:13:42,172 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:13:42,172 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:13:42,174 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (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 [2020-07-20 11:13:42,507 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:13:42,507 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:13:42,508 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 11:13:42,508 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:13:42,508 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:13:42,508 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:13:42,509 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 11:13:42,510 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:13:42,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:13:42,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:13:42,779 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:13:42,779 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:13:42,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:13:42 BoogieIcfgContainer [2020-07-20 11:13:42,787 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:13:42,789 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:13:42,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:13:42,795 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:13:42,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:13:41" (1/3) ... [2020-07-20 11:13:42,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a6ad02f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:13:42, skipping insertion in model container [2020-07-20 11:13:42,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:13:42" (2/3) ... [2020-07-20 11:13:42,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a6ad02f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:13:42, skipping insertion in model container [2020-07-20 11:13:42,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:13:42" (3/3) ... [2020-07-20 11:13:42,802 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-1.c [2020-07-20 11:13:42,827 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:13:42,864 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:13:42,938 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:13:43,030 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:13:43,030 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:13:43,031 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:13:43,031 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:13:43,031 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:13:43,031 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:13:43,031 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:13:43,032 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:13:43,062 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 11:13:43,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:13:43,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:43,076 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:13:43,076 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:43,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:43,085 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 11:13:43,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:43,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754054628] [2020-07-20 11:13:43,098 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 [2020-07-20 11:13:43,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:43,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:13:43,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:43,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:13:43,312 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:13:43,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754054628] [2020-07-20 11:13:43,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:13:43,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:13:43,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163481124] [2020-07-20 11:13:43,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:13:43,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:43,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:13:43,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:13:43,356 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 11:13:43,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:43,518 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:13:43,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:13:43,522 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:13:43,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:43,536 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:13:43,537 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:13:43,543 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 [2020-07-20 11:13:43,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:13:43,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:13:43,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:13:43,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:13:43,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 11:13:43,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:43,619 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:13:43,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:13:43,620 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:13:43,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:13:43,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:43,623 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:13:43,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:43,840 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:43,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:43,842 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 11:13:43,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:43,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582145135] [2020-07-20 11:13:43,843 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 [2020-07-20 11:13:43,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:43,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:13:43,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:43,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:13:43,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:13:43,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582145135] [2020-07-20 11:13:43,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:13:43,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:13:43,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084669682] [2020-07-20 11:13:43,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:13:43,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:43,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:13:43,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:13:43,947 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 11:13:44,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:44,060 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 11:13:44,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:13:44,061 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:13:44,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:44,063 INFO L225 Difference]: With dead ends: 27 [2020-07-20 11:13:44,064 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:13:44,066 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 [2020-07-20 11:13:44,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:13:44,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 11:13:44,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:13:44,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 11:13:44,078 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 11:13:44,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:44,079 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 11:13:44,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:13:44,079 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 11:13:44,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:13:44,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:44,082 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] [2020-07-20 11:13:44,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:44,297 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:44,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:44,298 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 11:13:44,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:44,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066558586] [2020-07-20 11:13:44,300 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 [2020-07-20 11:13:44,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:44,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:13:44,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:44,469 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:13:44,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:44,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:44,923 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:13:44,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066558586] [2020-07-20 11:13:44,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:44,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:13:44,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32092191] [2020-07-20 11:13:44,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:13:44,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:44,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:13:44,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:13:44,930 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 11:13:45,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:45,110 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 11:13:45,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:13:45,111 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 11:13:45,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:45,113 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:13:45,114 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:13:45,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:13:45,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:13:45,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 11:13:45,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:13:45,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:13:45,140 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 11:13:45,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:45,141 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:13:45,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:13:45,142 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:13:45,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:13:45,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:45,144 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] [2020-07-20 11:13:45,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:45,359 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:45,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:45,360 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 11:13:45,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:45,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923066465] [2020-07-20 11:13:45,362 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 [2020-07-20 11:13:45,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:45,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:13:45,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:45,453 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:13:45,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:45,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:45,710 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:13:45,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923066465] [2020-07-20 11:13:45,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:45,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:13:45,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685054863] [2020-07-20 11:13:45,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:13:45,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:45,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:13:45,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:13:45,715 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 11:13:45,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:45,870 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 11:13:45,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:13:45,873 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 11:13:45,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:45,884 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:13:45,884 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:13:45,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:13:45,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:13:45,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 11:13:45,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:13:45,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 11:13:45,912 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 11:13:45,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:45,912 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 11:13:45,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:13:45,913 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 11:13:45,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:13:45,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:45,916 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] [2020-07-20 11:13:46,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:46,133 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:46,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:46,134 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 11:13:46,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:46,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1078210227] [2020-07-20 11:13:46,136 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 [2020-07-20 11:13:46,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:46,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:13:46,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:46,270 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 11:13:46,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:46,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:46,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:46,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:46,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:46,707 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:13:46,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1078210227] [2020-07-20 11:13:46,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:46,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:13:46,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653578759] [2020-07-20 11:13:46,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:13:46,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:46,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:13:46,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:13:46,713 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 11:13:46,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:46,925 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 11:13:46,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:13:46,928 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 11:13:46,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:46,937 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:13:46,937 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:13:46,938 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 [2020-07-20 11:13:46,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:13:46,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 11:13:46,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:13:46,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:13:46,984 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 11:13:46,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:46,989 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:13:46,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:13:46,990 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:13:46,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 11:13:46,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:47,001 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] [2020-07-20 11:13:47,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:47,214 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:47,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:47,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 11:13:47,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:47,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321441522] [2020-07-20 11:13:47,217 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 [2020-07-20 11:13:47,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:47,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:13:47,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:47,321 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 11:13:47,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:47,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:47,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:47,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:47,725 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 11:13:47,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321441522] [2020-07-20 11:13:47,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:47,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:13:47,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983535665] [2020-07-20 11:13:47,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:13:47,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:47,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:13:47,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:13:47,729 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 11:13:47,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:47,932 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 11:13:47,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:13:47,933 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 11:13:47,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:47,935 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:13:47,936 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 11:13:47,942 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 [2020-07-20 11:13:47,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 11:13:47,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 11:13:47,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:13:47,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 11:13:47,967 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 11:13:47,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:47,970 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 11:13:47,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:13:47,970 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 11:13:47,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 11:13:47,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:47,988 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] [2020-07-20 11:13:48,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:48,203 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:48,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:48,204 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 11:13:48,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:48,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557015685] [2020-07-20 11:13:48,205 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 [2020-07-20 11:13:48,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:48,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:13:48,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:13:48,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:48,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:49,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:49,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:49,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:49,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:49,146 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:13:49,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557015685] [2020-07-20 11:13:49,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:49,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:13:49,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762278564] [2020-07-20 11:13:49,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:13:49,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:49,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:13:49,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:13:49,150 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 11:13:49,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:49,376 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 11:13:49,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:13:49,377 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 11:13:49,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:49,379 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:13:49,380 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:13:49,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:13:49,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:13:49,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 11:13:49,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:13:49,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:13:49,395 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 11:13:49,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:49,396 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:13:49,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:13:49,396 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:13:49,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 11:13:49,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:49,399 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] [2020-07-20 11:13:49,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:49,607 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:49,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:49,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 11:13:49,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:49,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096515004] [2020-07-20 11:13:49,609 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 [2020-07-20 11:13:49,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:49,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:13:49,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:49,757 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 11:13:49,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:50,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:50,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:50,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:50,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:50,570 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 11:13:50,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096515004] [2020-07-20 11:13:50,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:50,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:13:50,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962092296] [2020-07-20 11:13:50,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:13:50,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:50,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:13:50,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:13:50,574 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 11:13:50,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:50,742 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 11:13:50,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:13:50,743 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 11:13:50,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:50,746 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:13:50,746 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 11:13:50,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:13:50,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 11:13:50,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 11:13:50,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:13:50,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 11:13:50,764 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 11:13:50,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:50,765 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 11:13:50,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:13:50,765 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 11:13:50,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 11:13:50,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:50,767 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] [2020-07-20 11:13:50,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:50,982 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:50,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:50,983 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 11:13:50,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:50,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280445720] [2020-07-20 11:13:50,984 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 [2020-07-20 11:13:51,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:51,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:13:51,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:51,200 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 11:13:51,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:51,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:51,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:52,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:52,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:52,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:52,316 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 11:13:52,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280445720] [2020-07-20 11:13:52,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:52,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:13:52,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806804824] [2020-07-20 11:13:52,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:13:52,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:52,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:13:52,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:13:52,320 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 11:13:52,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:52,698 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 11:13:52,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:13:52,699 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 11:13:52,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:52,702 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:13:52,703 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 11:13:52,706 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 [2020-07-20 11:13:52,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 11:13:52,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 11:13:52,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:13:52,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:13:52,730 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 11:13:52,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:52,731 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:13:52,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:13:52,731 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:13:52,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 11:13:52,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:52,735 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] [2020-07-20 11:13:52,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:52,950 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:52,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:52,951 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 11:13:52,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:52,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288853735] [2020-07-20 11:13:52,952 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 [2020-07-20 11:13:53,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:53,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:13:53,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:53,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 11:13:53,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:54,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:54,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 11:13:54,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288853735] [2020-07-20 11:13:54,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:54,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:13:54,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955924994] [2020-07-20 11:13:54,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:13:54,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:54,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:13:54,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:13:54,603 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 11:13:54,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:54,824 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 11:13:54,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:13:54,827 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 11:13:54,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:54,829 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:13:54,830 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:13:54,832 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 [2020-07-20 11:13:54,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:13:54,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 11:13:54,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:13:54,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 11:13:54,848 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 11:13:54,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:54,849 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 11:13:54,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:13:54,849 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 11:13:54,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:13:54,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:54,854 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] [2020-07-20 11:13:55,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:55,070 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:55,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:55,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 11:13:55,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:55,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216823121] [2020-07-20 11:13:55,072 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 [2020-07-20 11:13:55,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:55,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:13:55,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:55,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 11:13:55,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:56,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:57,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 11:13:57,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216823121] [2020-07-20 11:13:57,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:57,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:13:57,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902906004] [2020-07-20 11:13:57,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:13:57,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:57,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:13:57,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:13:57,595 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 11:13:57,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:57,908 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 11:13:57,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:13:57,910 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 11:13:57,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:57,915 INFO L225 Difference]: With dead ends: 72 [2020-07-20 11:13:57,915 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 11:13:57,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:13:57,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 11:13:57,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 11:13:57,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:13:57,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:13:57,954 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 11:13:57,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:57,958 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:13:57,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:13:57,960 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:13:57,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 11:13:57,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:57,966 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] [2020-07-20 11:13:58,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:58,181 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:58,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:58,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 11:13:58,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:58,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680768790] [2020-07-20 11:13:58,184 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 [2020-07-20 11:13:58,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:58,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:13:58,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:58,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 11:13:58,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:59,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:00,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 11:14:00,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680768790] [2020-07-20 11:14:00,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:00,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-20 11:14:00,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980521687] [2020-07-20 11:14:00,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:14:00,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:00,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:14:00,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:14:00,661 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-20 11:14:00,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:00,952 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 11:14:00,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:14:00,953 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 299 [2020-07-20 11:14:00,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:00,963 INFO L225 Difference]: With dead ends: 77 [2020-07-20 11:14:00,963 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:14:00,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:14:00,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:14:01,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 11:14:01,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:14:01,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 11:14:01,007 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 11:14:01,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:01,009 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 11:14:01,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:14:01,009 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 11:14:01,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 11:14:01,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:01,031 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] [2020-07-20 11:14:01,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:01,246 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:01,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:01,247 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 11:14:01,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:01,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348143774] [2020-07-20 11:14:01,248 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 [2020-07-20 11:14:01,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:01,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:01,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:01,798 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 11:14:01,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:03,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:04,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:04,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:05,622 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 11:14:05,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348143774] [2020-07-20 11:14:05,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:05,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:05,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409555039] [2020-07-20 11:14:05,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:05,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:05,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:05,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:05,625 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-20 11:14:06,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:06,184 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 11:14:06,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:06,185 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 507 [2020-07-20 11:14:06,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:06,189 INFO L225 Difference]: With dead ends: 82 [2020-07-20 11:14:06,189 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:14:06,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:06,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:14:06,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 11:14:06,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:14:06,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 11:14:06,212 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 11:14:06,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:06,216 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 11:14:06,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:06,217 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 11:14:06,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 11:14:06,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:06,223 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] [2020-07-20 11:14:06,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:06,439 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:06,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:06,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 11:14:06,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:06,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443892133] [2020-07-20 11:14:06,442 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 [2020-07-20 11:14:06,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:06,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:06,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:06,929 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 648 proven. 1709 refuted. 0 times theorem prover too weak. 9325 trivial. 0 not checked. [2020-07-20 11:14:06,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:09,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:09,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:09,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:09,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:10,658 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 652 proven. 1756 refuted. 0 times theorem prover too weak. 9274 trivial. 0 not checked. [2020-07-20 11:14:10,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443892133] [2020-07-20 11:14:10,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:10,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:10,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939276307] [2020-07-20 11:14:10,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:10,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:10,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:10,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:10,663 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-20 11:14:11,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:11,098 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-20 11:14:11,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:11,100 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 450 [2020-07-20 11:14:11,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:11,105 INFO L225 Difference]: With dead ends: 147 [2020-07-20 11:14:11,105 INFO L226 Difference]: Without dead ends: 70 [2020-07-20 11:14:11,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:11,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-20 11:14:11,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-20 11:14:11,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 11:14:11,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-20 11:14:11,151 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 450 [2020-07-20 11:14:11,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:11,154 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-20 11:14:11,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:11,191 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-20 11:14:11,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 11:14:11,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:11,196 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 38, 23, 23, 23, 23, 23, 23, 23, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:11,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:11,410 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:11,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:11,412 INFO L82 PathProgramCache]: Analyzing trace with hash -530192014, now seen corresponding path program 7 times [2020-07-20 11:14:11,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:11,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412226096] [2020-07-20 11:14:11,414 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 [2020-07-20 11:14:11,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:11,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:11,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:11,913 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 467 refuted. 0 times theorem prover too weak. 4481 trivial. 0 not checked. [2020-07-20 11:14:11,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:13,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:13,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:13,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 518 refuted. 0 times theorem prover too weak. 4430 trivial. 0 not checked. [2020-07-20 11:14:14,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412226096] [2020-07-20 11:14:14,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:14,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:14,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702868460] [2020-07-20 11:14:14,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:14,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:14,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:14,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:14,954 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 18 states. [2020-07-20 11:14:15,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:15,310 INFO L93 Difference]: Finished difference Result 120 states and 219 transitions. [2020-07-20 11:14:15,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:15,311 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 327 [2020-07-20 11:14:15,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:15,316 INFO L225 Difference]: With dead ends: 120 [2020-07-20 11:14:15,317 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:14:15,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 622 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:15,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:14:15,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 90. [2020-07-20 11:14:15,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 11:14:15,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 167 transitions. [2020-07-20 11:14:15,338 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 167 transitions. Word has length 327 [2020-07-20 11:14:15,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:15,339 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 167 transitions. [2020-07-20 11:14:15,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:15,340 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 167 transitions. [2020-07-20 11:14:15,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 11:14:15,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:15,346 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:15,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:15,560 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:15,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:15,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-20 11:14:15,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:15,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297254110] [2020-07-20 11:14:15,562 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 [2020-07-20 11:14:15,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:15,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 167 conjunts are in the unsatisfiable core [2020-07-20 11:14:15,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:16,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-20 11:14:16,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:20,457 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 0 proven. 1500 refuted. 0 times theorem prover too weak. 3068 trivial. 0 not checked. [2020-07-20 11:14:20,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297254110] [2020-07-20 11:14:20,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:20,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-20 11:14:20,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93048679] [2020-07-20 11:14:20,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 11:14:20,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:20,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 11:14:20,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-20 11:14:20,460 INFO L87 Difference]: Start difference. First operand 90 states and 167 transitions. Second operand 28 states. [2020-07-20 11:14:21,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:21,099 INFO L93 Difference]: Finished difference Result 223 states and 571 transitions. [2020-07-20 11:14:21,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 11:14:21,100 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 286 [2020-07-20 11:14:21,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:21,115 INFO L225 Difference]: With dead ends: 223 [2020-07-20 11:14:21,115 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 11:14:21,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 534 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=81, Invalid=911, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:14:21,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 11:14:21,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 150. [2020-07-20 11:14:21,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 11:14:21,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 386 transitions. [2020-07-20 11:14:21,190 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 386 transitions. Word has length 286 [2020-07-20 11:14:21,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:21,191 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 386 transitions. [2020-07-20 11:14:21,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 11:14:21,192 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 386 transitions. [2020-07-20 11:14:21,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 361 [2020-07-20 11:14:21,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:21,205 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 35, 26, 26, 26, 26, 26, 26, 26, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:21,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:21,420 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:21,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:21,421 INFO L82 PathProgramCache]: Analyzing trace with hash -144072787, now seen corresponding path program 9 times [2020-07-20 11:14:21,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:21,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307750814] [2020-07-20 11:14:21,423 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 [2020-07-20 11:14:21,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:21,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:21,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:21,853 INFO L134 CoverageAnalysis]: Checked inductivity of 7407 backedges. 462 proven. 1349 refuted. 0 times theorem prover too weak. 5596 trivial. 0 not checked. [2020-07-20 11:14:21,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:23,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,917 INFO L134 CoverageAnalysis]: Checked inductivity of 7407 backedges. 468 proven. 1394 refuted. 0 times theorem prover too weak. 5545 trivial. 0 not checked. [2020-07-20 11:14:24,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307750814] [2020-07-20 11:14:24,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:24,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:24,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647198193] [2020-07-20 11:14:24,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:24,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:24,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:24,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:24,921 INFO L87 Difference]: Start difference. First operand 150 states and 386 transitions. Second operand 18 states. [2020-07-20 11:14:25,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:25,234 INFO L93 Difference]: Finished difference Result 276 states and 720 transitions. [2020-07-20 11:14:25,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:25,235 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 360 [2020-07-20 11:14:25,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:25,242 INFO L225 Difference]: With dead ends: 276 [2020-07-20 11:14:25,242 INFO L226 Difference]: Without dead ends: 150 [2020-07-20 11:14:25,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 726 GetRequests, 688 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:25,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-20 11:14:25,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 147. [2020-07-20 11:14:25,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 11:14:25,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 267 transitions. [2020-07-20 11:14:25,285 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 267 transitions. Word has length 360 [2020-07-20 11:14:25,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:25,286 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 267 transitions. [2020-07-20 11:14:25,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:25,286 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 267 transitions. [2020-07-20 11:14:25,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 11:14:25,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:25,297 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 36, 24, 24, 24, 24, 24, 24, 24, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:25,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:25,512 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:25,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:25,512 INFO L82 PathProgramCache]: Analyzing trace with hash -366796827, now seen corresponding path program 10 times [2020-07-20 11:14:25,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:25,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828690606] [2020-07-20 11:14:25,513 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 [2020-07-20 11:14:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:25,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:25,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:25,984 INFO L134 CoverageAnalysis]: Checked inductivity of 6438 backedges. 755 proven. 855 refuted. 0 times theorem prover too weak. 4828 trivial. 0 not checked. [2020-07-20 11:14:25,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:27,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:27,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:29,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:29,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6438 backedges. 757 proven. 904 refuted. 0 times theorem prover too weak. 4777 trivial. 0 not checked. [2020-07-20 11:14:29,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828690606] [2020-07-20 11:14:29,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:29,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:29,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966627314] [2020-07-20 11:14:29,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:29,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:29,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:29,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:29,586 INFO L87 Difference]: Start difference. First operand 147 states and 267 transitions. Second operand 18 states. [2020-07-20 11:14:29,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:29,912 INFO L93 Difference]: Finished difference Result 175 states and 302 transitions. [2020-07-20 11:14:29,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:29,913 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 337 [2020-07-20 11:14:29,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:29,919 INFO L225 Difference]: With dead ends: 175 [2020-07-20 11:14:29,919 INFO L226 Difference]: Without dead ends: 158 [2020-07-20 11:14:29,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 642 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:29,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-20 11:14:29,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 121. [2020-07-20 11:14:29,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 11:14:29,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 217 transitions. [2020-07-20 11:14:29,951 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 217 transitions. Word has length 337 [2020-07-20 11:14:29,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:29,952 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 217 transitions. [2020-07-20 11:14:29,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:29,952 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 217 transitions. [2020-07-20 11:14:29,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 11:14:29,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:29,959 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 33, 24, 24, 24, 24, 24, 24, 24, 16, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:30,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:30,174 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:30,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:30,174 INFO L82 PathProgramCache]: Analyzing trace with hash -214363809, now seen corresponding path program 11 times [2020-07-20 11:14:30,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:30,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574373995] [2020-07-20 11:14:30,175 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 [2020-07-20 11:14:30,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:30,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:14:30,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:30,593 INFO L134 CoverageAnalysis]: Checked inductivity of 6336 backedges. 384 proven. 1069 refuted. 0 times theorem prover too weak. 4883 trivial. 0 not checked. [2020-07-20 11:14:30,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:32,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:33,076 INFO L134 CoverageAnalysis]: Checked inductivity of 6336 backedges. 385 proven. 1103 refuted. 0 times theorem prover too weak. 4848 trivial. 0 not checked. [2020-07-20 11:14:33,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574373995] [2020-07-20 11:14:33,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:33,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-20 11:14:33,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225828130] [2020-07-20 11:14:33,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:33,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:33,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:33,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:33,081 INFO L87 Difference]: Start difference. First operand 121 states and 217 transitions. Second operand 18 states. [2020-07-20 11:14:33,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:33,381 INFO L93 Difference]: Finished difference Result 216 states and 387 transitions. [2020-07-20 11:14:33,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:33,381 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 334 [2020-07-20 11:14:33,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:33,385 INFO L225 Difference]: With dead ends: 216 [2020-07-20 11:14:33,386 INFO L226 Difference]: Without dead ends: 121 [2020-07-20 11:14:33,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 638 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:14:33,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-07-20 11:14:33,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-07-20 11:14:33,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 11:14:33,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 201 transitions. [2020-07-20 11:14:33,420 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 201 transitions. Word has length 334 [2020-07-20 11:14:33,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:33,421 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 201 transitions. [2020-07-20 11:14:33,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:33,421 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 201 transitions. [2020-07-20 11:14:33,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-20 11:14:33,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:33,428 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:33,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:33,644 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:33,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:33,644 INFO L82 PathProgramCache]: Analyzing trace with hash 476971754, now seen corresponding path program 12 times [2020-07-20 11:14:33,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:33,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545972662] [2020-07-20 11:14:33,646 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 [2020-07-20 11:14:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:33,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 11:14:33,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:34,057 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 814 proven. 272 refuted. 0 times theorem prover too weak. 3894 trivial. 0 not checked. [2020-07-20 11:14:34,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:34,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 814 proven. 296 refuted. 0 times theorem prover too weak. 3870 trivial. 0 not checked. [2020-07-20 11:14:35,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545972662] [2020-07-20 11:14:35,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:35,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-20 11:14:35,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083626542] [2020-07-20 11:14:35,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:14:35,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:35,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:14:35,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:14:35,851 INFO L87 Difference]: Start difference. First operand 121 states and 201 transitions. Second operand 16 states. [2020-07-20 11:14:36,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:36,067 INFO L93 Difference]: Finished difference Result 196 states and 332 transitions. [2020-07-20 11:14:36,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:14:36,068 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 298 [2020-07-20 11:14:36,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:36,072 INFO L225 Difference]: With dead ends: 196 [2020-07-20 11:14:36,072 INFO L226 Difference]: Without dead ends: 189 [2020-07-20 11:14:36,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 600 GetRequests, 570 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:14:36,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-20 11:14:36,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 129. [2020-07-20 11:14:36,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 11:14:36,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 219 transitions. [2020-07-20 11:14:36,104 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 219 transitions. Word has length 298 [2020-07-20 11:14:36,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:36,104 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 219 transitions. [2020-07-20 11:14:36,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:14:36,104 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 219 transitions. [2020-07-20 11:14:36,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 11:14:36,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:36,113 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:36,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:36,327 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:36,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:36,328 INFO L82 PathProgramCache]: Analyzing trace with hash 803782837, now seen corresponding path program 13 times [2020-07-20 11:14:36,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:36,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1621554724] [2020-07-20 11:14:36,328 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 [2020-07-20 11:14:36,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:36,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:14:36,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 619 proven. 714 refuted. 0 times theorem prover too weak. 4079 trivial. 0 not checked. [2020-07-20 11:14:36,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:38,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:38,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:38,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:38,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:38,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:38,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:39,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 616 proven. 752 refuted. 0 times theorem prover too weak. 4044 trivial. 0 not checked. [2020-07-20 11:14:39,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1621554724] [2020-07-20 11:14:39,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:39,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-20 11:14:39,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192585308] [2020-07-20 11:14:39,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:39,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:39,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:39,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:39,289 INFO L87 Difference]: Start difference. First operand 129 states and 219 transitions. Second operand 18 states. [2020-07-20 11:14:39,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:39,541 INFO L93 Difference]: Finished difference Result 168 states and 271 transitions. [2020-07-20 11:14:39,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:39,542 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 310 [2020-07-20 11:14:39,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:39,545 INFO L225 Difference]: With dead ends: 168 [2020-07-20 11:14:39,545 INFO L226 Difference]: Without dead ends: 156 [2020-07-20 11:14:39,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 590 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:14:39,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2020-07-20 11:14:39,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2020-07-20 11:14:39,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 11:14:39,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 206 transitions. [2020-07-20 11:14:39,569 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 206 transitions. Word has length 310 [2020-07-20 11:14:39,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:39,570 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 206 transitions. [2020-07-20 11:14:39,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:39,570 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 206 transitions. [2020-07-20 11:14:39,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2020-07-20 11:14:39,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:39,577 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 33, 22, 22, 22, 22, 22, 22, 22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:39,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:39,791 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:39,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:39,792 INFO L82 PathProgramCache]: Analyzing trace with hash 108356745, now seen corresponding path program 14 times [2020-07-20 11:14:39,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:39,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938695707] [2020-07-20 11:14:39,793 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 [2020-07-20 11:14:40,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:40,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:14:40,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:40,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 446 proven. 887 refuted. 0 times theorem prover too weak. 4079 trivial. 0 not checked. [2020-07-20 11:14:40,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:41,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 445 proven. 923 refuted. 0 times theorem prover too weak. 4044 trivial. 0 not checked. [2020-07-20 11:14:42,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938695707] [2020-07-20 11:14:42,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:42,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-20 11:14:42,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066038602] [2020-07-20 11:14:42,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:42,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:42,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:42,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:42,884 INFO L87 Difference]: Start difference. First operand 124 states and 206 transitions. Second operand 18 states. [2020-07-20 11:14:43,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:43,132 INFO L93 Difference]: Finished difference Result 153 states and 240 transitions. [2020-07-20 11:14:43,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:43,136 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 310 [2020-07-20 11:14:43,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:43,138 INFO L225 Difference]: With dead ends: 153 [2020-07-20 11:14:43,138 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 11:14:43,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 590 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:14:43,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 11:14:43,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 121. [2020-07-20 11:14:43,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 11:14:43,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 195 transitions. [2020-07-20 11:14:43,157 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 195 transitions. Word has length 310 [2020-07-20 11:14:43,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:43,158 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 195 transitions. [2020-07-20 11:14:43,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:43,158 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 195 transitions. [2020-07-20 11:14:43,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-20 11:14:43,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:43,164 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:43,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:43,378 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:43,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:43,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1448945942, now seen corresponding path program 15 times [2020-07-20 11:14:43,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:43,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124996361] [2020-07-20 11:14:43,380 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 [2020-07-20 11:14:43,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:43,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:14:43,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:43,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 960 proven. 313 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-20 11:14:43,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:45,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:45,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:46,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 955 proven. 353 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-20 11:14:46,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124996361] [2020-07-20 11:14:46,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:46,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-20 11:14:46,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313717766] [2020-07-20 11:14:46,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:46,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:46,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:46,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:46,317 INFO L87 Difference]: Start difference. First operand 121 states and 195 transitions. Second operand 18 states. [2020-07-20 11:14:46,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:46,579 INFO L93 Difference]: Finished difference Result 181 states and 282 transitions. [2020-07-20 11:14:46,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:46,580 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-20 11:14:46,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:46,584 INFO L225 Difference]: With dead ends: 181 [2020-07-20 11:14:46,584 INFO L226 Difference]: Without dead ends: 164 [2020-07-20 11:14:46,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:14:46,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-20 11:14:46,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 81. [2020-07-20 11:14:46,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 11:14:46,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 125 transitions. [2020-07-20 11:14:46,602 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 125 transitions. Word has length 298 [2020-07-20 11:14:46,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:46,602 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 125 transitions. [2020-07-20 11:14:46,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:46,602 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 125 transitions. [2020-07-20 11:14:46,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-20 11:14:46,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:46,607 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:46,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:46,821 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:46,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:46,822 INFO L82 PathProgramCache]: Analyzing trace with hash -258866501, now seen corresponding path program 16 times [2020-07-20 11:14:46,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:46,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842529174] [2020-07-20 11:14:46,823 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 [2020-07-20 11:14:47,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:47,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:47,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:47,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 270 proven. 1062 refuted. 0 times theorem prover too weak. 3269 trivial. 0 not checked. [2020-07-20 11:14:47,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:49,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:49,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:49,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:49,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:49,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,211 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 280 proven. 1103 refuted. 0 times theorem prover too weak. 3218 trivial. 0 not checked. [2020-07-20 11:14:50,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842529174] [2020-07-20 11:14:50,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:50,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-20 11:14:50,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060408621] [2020-07-20 11:14:50,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:50,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:50,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:50,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:50,214 INFO L87 Difference]: Start difference. First operand 81 states and 125 transitions. Second operand 18 states. [2020-07-20 11:14:50,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:50,502 INFO L93 Difference]: Finished difference Result 180 states and 281 transitions. [2020-07-20 11:14:50,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:50,503 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 287 [2020-07-20 11:14:50,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:50,505 INFO L225 Difference]: With dead ends: 180 [2020-07-20 11:14:50,505 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 11:14:50,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 542 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:50,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 11:14:50,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2020-07-20 11:14:50,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 11:14:50,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 96 transitions. [2020-07-20 11:14:50,519 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 96 transitions. Word has length 287 [2020-07-20 11:14:50,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:50,520 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 96 transitions. [2020-07-20 11:14:50,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:50,520 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 96 transitions. [2020-07-20 11:14:50,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-20 11:14:50,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:50,523 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:50,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:50,737 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:50,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:50,743 INFO L82 PathProgramCache]: Analyzing trace with hash -551621334, now seen corresponding path program 17 times [2020-07-20 11:14:50,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:50,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531175203] [2020-07-20 11:14:50,744 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 [2020-07-20 11:14:51,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:51,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:14:51,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:51,279 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 321 proven. 952 refuted. 0 times theorem prover too weak. 3707 trivial. 0 not checked. [2020-07-20 11:14:51,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:52,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:52,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 324 proven. 984 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2020-07-20 11:14:53,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531175203] [2020-07-20 11:14:53,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:53,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 18 [2020-07-20 11:14:53,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228819369] [2020-07-20 11:14:53,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:14:53,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:53,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:14:53,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:14:53,790 INFO L87 Difference]: Start difference. First operand 78 states and 96 transitions. Second operand 18 states. [2020-07-20 11:14:54,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:54,035 INFO L93 Difference]: Finished difference Result 105 states and 126 transitions. [2020-07-20 11:14:54,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:54,036 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 298 [2020-07-20 11:14:54,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:54,038 INFO L225 Difference]: With dead ends: 105 [2020-07-20 11:14:54,039 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 11:14:54,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 566 SyntacticMatches, 13 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=360, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:14:54,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 11:14:54,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-07-20 11:14:54,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 11:14:54,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2020-07-20 11:14:54,049 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 298 [2020-07-20 11:14:54,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:54,049 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2020-07-20 11:14:54,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:14:54,049 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2020-07-20 11:14:54,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-20 11:14:54,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:54,053 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 33, 21, 21, 21, 21, 21, 21, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:54,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:54,267 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:54,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:54,268 INFO L82 PathProgramCache]: Analyzing trace with hash -2133540566, now seen corresponding path program 18 times [2020-07-20 11:14:54,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:54,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44011801] [2020-07-20 11:14:54,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 11:14:54,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:54,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 11:14:54,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:54,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 328 proven. 1119 refuted. 0 times theorem prover too weak. 3533 trivial. 0 not checked. [2020-07-20 11:14:54,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:56,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:57,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:57,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:57,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:57,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:58,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:58,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:58,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:58,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:58,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4980 backedges. 322 proven. 1176 refuted. 0 times theorem prover too weak. 3482 trivial. 0 not checked. [2020-07-20 11:14:58,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44011801] [2020-07-20 11:14:58,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:58,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18] total 20 [2020-07-20 11:14:58,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789120411] [2020-07-20 11:14:58,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:14:58,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:58,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:14:58,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:14:58,267 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand 20 states. [2020-07-20 11:14:58,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:58,623 INFO L93 Difference]: Finished difference Result 138 states and 164 transitions. [2020-07-20 11:14:58,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:14:58,624 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 298 [2020-07-20 11:14:58,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:58,626 INFO L225 Difference]: With dead ends: 138 [2020-07-20 11:14:58,626 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:14:58,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:14:58,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:14:58,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:14:58,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:14:58,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:14:58,638 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 298 [2020-07-20 11:14:58,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:58,638 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:14:58,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:14:58,638 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:14:58,639 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:14:58,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:58,857 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:14:59,953 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:01,356 WARN L193 SmtUtils]: Spent 1.40 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:02,615 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification. DAG size of input: 330 DAG size of output: 155 [2020-07-20 11:15:03,471 WARN L193 SmtUtils]: Spent 852.00 ms on a formula simplification. DAG size of input: 337 DAG size of output: 157 [2020-07-20 11:15:03,835 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:05,392 WARN L193 SmtUtils]: Spent 1.55 s on a formula simplification. DAG size of input: 356 DAG size of output: 178 [2020-07-20 11:15:05,811 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:06,021 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:07,111 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 346 DAG size of output: 159 [2020-07-20 11:15:08,286 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:08,681 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification. DAG size of input: 294 DAG size of output: 133 [2020-07-20 11:15:08,873 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:09,291 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 110 [2020-07-20 11:15:10,255 WARN L193 SmtUtils]: Spent 962.00 ms on a formula simplification. DAG size of input: 343 DAG size of output: 153 [2020-07-20 11:15:10,456 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:11,502 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:11,699 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:12,778 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:13,759 WARN L193 SmtUtils]: Spent 926.00 ms on a formula simplification. DAG size of input: 343 DAG size of output: 153 [2020-07-20 11:15:14,759 WARN L193 SmtUtils]: Spent 997.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:15,838 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:16,869 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:17,253 WARN L193 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 110 [2020-07-20 11:15:18,260 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 349 DAG size of output: 162 [2020-07-20 11:15:19,268 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:19,681 WARN L193 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 110 [2020-07-20 11:15:20,672 WARN L193 SmtUtils]: Spent 988.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:20,871 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:21,048 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 79 [2020-07-20 11:15:22,042 WARN L193 SmtUtils]: Spent 991.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:23,153 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:24,178 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:24,400 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 79 [2020-07-20 11:15:25,313 WARN L193 SmtUtils]: Spent 910.00 ms on a formula simplification. DAG size of input: 340 DAG size of output: 157 [2020-07-20 11:15:26,287 WARN L193 SmtUtils]: Spent 972.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:26,665 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 256 DAG size of output: 110 [2020-07-20 11:15:27,669 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 327 DAG size of output: 152 [2020-07-20 11:15:27,925 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:28,491 WARN L193 SmtUtils]: Spent 563.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 128 [2020-07-20 11:15:29,486 WARN L193 SmtUtils]: Spent 992.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:29,711 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 79 [2020-07-20 11:15:30,094 WARN L193 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:31,104 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:31,306 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:31,693 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:32,043 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 105 [2020-07-20 11:15:33,029 WARN L193 SmtUtils]: Spent 984.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:34,087 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:34,291 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:34,930 WARN L193 SmtUtils]: Spent 636.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 124 [2020-07-20 11:15:35,897 WARN L193 SmtUtils]: Spent 963.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:36,074 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 79 [2020-07-20 11:15:37,033 WARN L193 SmtUtils]: Spent 956.00 ms on a formula simplification. DAG size of input: 340 DAG size of output: 157 [2020-07-20 11:15:37,283 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:38,289 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 346 DAG size of output: 159 [2020-07-20 11:15:38,501 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 85 [2020-07-20 11:15:39,639 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 327 DAG size of output: 152 [2020-07-20 11:15:40,047 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 105 [2020-07-20 11:15:41,057 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:41,444 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:42,098 WARN L193 SmtUtils]: Spent 652.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 137 [2020-07-20 11:15:42,290 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 85 [2020-07-20 11:15:43,295 WARN L193 SmtUtils]: Spent 1.00 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:43,532 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 217 DAG size of output: 93 [2020-07-20 11:15:44,509 WARN L193 SmtUtils]: Spent 975.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 152 [2020-07-20 11:15:45,493 WARN L193 SmtUtils]: Spent 981.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:45,692 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:46,584 WARN L193 SmtUtils]: Spent 889.00 ms on a formula simplification. DAG size of input: 334 DAG size of output: 154 [2020-07-20 11:15:46,876 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 217 DAG size of output: 93 [2020-07-20 11:15:47,863 WARN L193 SmtUtils]: Spent 985.00 ms on a formula simplification. DAG size of input: 346 DAG size of output: 159 [2020-07-20 11:15:48,247 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:49,173 WARN L193 SmtUtils]: Spent 924.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 145 [2020-07-20 11:15:49,375 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:50,393 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification. DAG size of input: 333 DAG size of output: 152 [2020-07-20 11:15:51,112 WARN L193 SmtUtils]: Spent 709.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 132 [2020-07-20 11:15:51,315 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 87 [2020-07-20 11:15:52,331 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:53,035 WARN L193 SmtUtils]: Spent 701.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 146 [2020-07-20 11:15:53,412 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 110 [2020-07-20 11:15:54,270 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification. DAG size of input: 331 DAG size of output: 148 [2020-07-20 11:15:55,306 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification. DAG size of input: 352 DAG size of output: 159 [2020-07-20 11:15:55,700 WARN L193 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 110 [2020-07-20 11:15:56,618 WARN L193 SmtUtils]: Spent 916.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 145 [2020-07-20 11:15:57,612 WARN L193 SmtUtils]: Spent 991.00 ms on a formula simplification. DAG size of input: 346 DAG size of output: 159 [2020-07-20 11:16:02,522 WARN L193 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 314 DAG size of output: 42 [2020-07-20 11:16:02,561 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 11:16:02,561 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:16:02,561 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:16:02,562 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 11:16:02,562 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 11:16:02,562 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 11:16:02,562 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-20 11:16:02,562 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-20 11:16:02,562 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-20 11:16:02,562 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-20 11:16:02,563 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= 7 main_~x~0) (<= main_~x~0 7)) [2020-07-20 11:16:02,563 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-20 11:16:02,563 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-20 11:16:02,563 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-20 11:16:02,563 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-20 11:16:02,563 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-20 11:16:02,564 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-20 11:16:02,564 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-20 11:16:02,564 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 11:16:02,566 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (let ((.cse4 (and .cse1 .cse2 (= 5 |fibo_#t~ret0|) (<= 6 |fibo_#in~n|))) (.cse3 (<= |fibo_#in~n| 3)) (.cse5 (and (<= 4 |fibo_#in~n|) .cse1 (= |fibo_#t~ret0| 2) .cse2 (<= |fibo_#in~n| 4))) (.cse6 (and .cse1 .cse2 (<= 7 |fibo_#in~n|))) (.cse0 (<= 5 |fibo_#in~n|))) (and (or (and .cse0 .cse1 .cse2 (<= |fibo_#in~n| 5)) (and .cse1 .cse2 (<= 3 |fibo_#in~n|) .cse3) .cse4 .cse5 (and .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)) .cse6) (or .cse4 (and (= |fibo_#t~ret0| 1) .cse3) .cse5 .cse6 (and .cse0 (= |fibo_#t~ret0| 3))) (or (<= |fibo_#in~n| 6) (<= 8 |fibo_#in~n|) (= |fibo_#t~ret0| 8))))) [2020-07-20 11:16:02,567 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-20 11:16:02,567 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-20 11:16:02,567 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-20 11:16:02,567 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-20 11:16:02,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:16:02 BoogieIcfgContainer [2020-07-20 11:16:02,579 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:16:02,581 INFO L168 Benchmark]: Toolchain (without parser) took 140922.87 ms. Allocated memory was 136.3 MB in the beginning and 1.4 GB in the end (delta: 1.3 GB). Free memory was 99.7 MB in the beginning and 650.4 MB in the end (delta: -550.7 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2020-07-20 11:16:02,582 INFO L168 Benchmark]: CDTParser took 0.53 ms. Allocated memory is still 136.3 MB. Free memory is still 117.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 11:16:02,582 INFO L168 Benchmark]: CACSL2BoogieTranslator took 441.84 ms. Allocated memory is still 136.3 MB. Free memory was 99.3 MB in the beginning and 90.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:02,583 INFO L168 Benchmark]: Boogie Preprocessor took 63.29 ms. Allocated memory is still 136.3 MB. Free memory was 90.1 MB in the beginning and 88.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:02,583 INFO L168 Benchmark]: RCFGBuilder took 615.98 ms. Allocated memory was 136.3 MB in the beginning and 206.0 MB in the end (delta: 69.7 MB). Free memory was 88.7 MB in the beginning and 173.8 MB in the end (delta: -85.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:02,584 INFO L168 Benchmark]: TraceAbstraction took 139789.54 ms. Allocated memory was 206.0 MB in the beginning and 1.4 GB in the end (delta: 1.2 GB). Free memory was 173.8 MB in the beginning and 650.4 MB in the end (delta: -476.6 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. [2020-07-20 11:16:02,587 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.53 ms. Allocated memory is still 136.3 MB. Free memory is still 117.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 441.84 ms. Allocated memory is still 136.3 MB. Free memory was 99.3 MB in the beginning and 90.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 63.29 ms. Allocated memory is still 136.3 MB. Free memory was 90.1 MB in the beginning and 88.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 615.98 ms. Allocated memory was 136.3 MB in the beginning and 206.0 MB in the end (delta: 69.7 MB). Free memory was 88.7 MB in the beginning and 173.8 MB in the end (delta: -85.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 139789.54 ms. Allocated memory was 206.0 MB in the beginning and 1.4 GB in the end (delta: 1.2 GB). Free memory was 173.8 MB in the beginning and 650.4 MB in the end (delta: -476.6 MB). Peak memory consumption was 1.3 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 75.8s, OverallIterations: 26, TraceHistogramMax: 77, AutomataDifference: 7.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 63.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 677 SDtfs, 875 SDslu, 3196 SDs, 0 SdLazy, 3792 SolverSat, 1311 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11914 GetRequests, 11162 SyntacticMatches, 273 SemanticMatches, 479 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2262 ImplicationChecksByTransitivity, 7.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=150occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 26 MinimizatonAttempts, 485 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 293 PreInvPairs, 13407 NumberOfFragments, 166 HoareAnnotationTreeSize, 293 FomulaSimplifications, 553741042 FormulaSimplificationTreeSizeReduction, 58.9s HoareSimplificationTime, 8 FomulaSimplificationsInter, 332308 FormulaSimplificationTreeSizeReductionInter, 4.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.7s SatisfiabilityAnalysisTime, 56.5s InterpolantComputationTime, 5913 NumberOfCodeBlocks, 5913 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 11749 ConstructedInterpolants, 0 QuantifiedInterpolants, 5432968 SizeOfPredicates, 151 NumberOfNonLiveVariables, 13172 ConjunctsInSsa, 476 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 176434/212080 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...