/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_2calls_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:07:34,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:07:34,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:07:34,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:07:34,481 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:07:34,483 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:07:34,486 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:07:34,491 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:07:34,496 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:07:34,503 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:07:34,508 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:07:34,513 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:07:34,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:07:34,518 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:07:34,521 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:07:34,524 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:07:34,528 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:07:34,534 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:07:34,540 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:07:34,549 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:07:34,555 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:07:34,562 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:07:34,565 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:07:34,567 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:07:34,574 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:07:34,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:07:34,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:07:34,605 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:07:34,607 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 11:07:34,627 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:07:34,627 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:07:34,630 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:07:34,630 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:07:34,630 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:07:34,631 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:07:34,631 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:07:34,631 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:07:34,631 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:07:34,632 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:07:34,632 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:07:34,632 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:07:34,632 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:07:34,633 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:07:34,633 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:07:34,633 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:07:34,633 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:07:34,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:07:34,634 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:07:34,634 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:07:34,634 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:07:34,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:07:34,635 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:07:34,635 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:07:34,635 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:07:34,636 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:07:34,636 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:34,636 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:07:34,636 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:07:34,637 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 11:07:35,016 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:07:35,046 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:07:35,053 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:07:35,056 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:07:35,057 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:07:35,058 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 11:07:35,198 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7018560b7/25b05a51484247779f90cffa2ca7a094/FLAG2f006b799 [2020-07-20 11:07:36,036 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:07:36,037 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 11:07:36,050 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7018560b7/25b05a51484247779f90cffa2ca7a094/FLAG2f006b799 [2020-07-20 11:07:36,081 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7018560b7/25b05a51484247779f90cffa2ca7a094 [2020-07-20 11:07:36,102 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:07:36,107 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:07:36,110 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:07:36,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:07:36,117 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:07:36,118 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6454df86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36, skipping insertion in model container [2020-07-20 11:07:36,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,133 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:07:36,162 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:07:36,536 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:07:36,546 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:07:36,578 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:07:36,609 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:07:36,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36 WrapperNode [2020-07-20 11:07:36,611 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:07:36,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:07:36,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:07:36,615 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:07:36,640 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,644 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,659 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,856 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (1/1) ... [2020-07-20 11:07:36,866 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:07:36,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:07:36,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:07:36,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:07:36,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (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 11:07:36,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:07:36,998 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:07:36,998 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 11:07:36,998 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 11:07:36,998 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:07:36,999 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:07:36,999 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:07:36,999 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 11:07:36,999 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 11:07:37,000 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:07:37,000 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:07:37,000 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:07:37,327 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:07:37,328 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:07:37,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:07:37 BoogieIcfgContainer [2020-07-20 11:07:37,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:07:37,340 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:07:37,340 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:07:37,347 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:07:37,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:07:36" (1/3) ... [2020-07-20 11:07:37,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ae1878 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:07:37, skipping insertion in model container [2020-07-20 11:07:37,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:07:36" (2/3) ... [2020-07-20 11:07:37,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ae1878 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:07:37, skipping insertion in model container [2020-07-20 11:07:37,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:07:37" (3/3) ... [2020-07-20 11:07:37,355 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-1.c [2020-07-20 11:07:37,378 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:07:37,394 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:07:37,451 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:07:37,543 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:07:37,543 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:07:37,543 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:07:37,544 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:07:37,544 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:07:37,544 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:07:37,544 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:07:37,545 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:07:37,596 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:07:37,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:07:37,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:37,638 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:37,639 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:37,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:37,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 11:07:37,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:37,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335024094] [2020-07-20 11:07:37,686 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 11:07:37,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:37,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:07:37,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:37,938 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 11:07:37,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:07:37,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335024094] [2020-07-20 11:07:37,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:07:37,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:07:37,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54654925] [2020-07-20 11:07:37,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:07:37,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:37,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:07:37,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:07:37,985 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 11:07:38,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:38,186 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 11:07:38,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:07:38,190 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:07:38,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:38,207 INFO L225 Difference]: With dead ends: 44 [2020-07-20 11:07:38,208 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:07:38,215 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 11:07:38,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:07:38,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 11:07:38,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:07:38,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:07:38,303 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 11:07:38,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:38,304 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:07:38,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:07:38,305 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:07:38,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:07:38,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:38,309 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:38,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:38,525 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:38,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:38,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 11:07:38,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:38,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059577456] [2020-07-20 11:07:38,529 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 11:07:38,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:38,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:07:38,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:38,645 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 11:07:38,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:07:38,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059577456] [2020-07-20 11:07:38,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:07:38,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:07:38,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204672353] [2020-07-20 11:07:38,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:07:38,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:38,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:07:38,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:07:38,653 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 11:07:38,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:38,794 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 11:07:38,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:07:38,795 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:07:38,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:38,798 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:07:38,798 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 11:07:38,801 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 11:07:38,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 11:07:38,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 11:07:38,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:07:38,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:07:38,815 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 11:07:38,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:38,816 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:07:38,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:07:38,817 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:07:38,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:07:38,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:38,819 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:39,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:39,036 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:39,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:39,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 11:07:39,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:39,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259671962] [2020-07-20 11:07:39,039 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 11:07:39,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:39,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:07:39,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:39,246 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:07:39,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:39,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:39,774 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:07:39,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259671962] [2020-07-20 11:07:39,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:39,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:07:39,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357058645] [2020-07-20 11:07:39,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:07:39,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:39,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:07:39,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:07:39,779 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 11:07:40,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:40,049 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 11:07:40,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:07:40,051 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 11:07:40,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:40,054 INFO L225 Difference]: With dead ends: 41 [2020-07-20 11:07:40,054 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:07:40,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:07:40,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:07:40,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 11:07:40,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:07:40,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:07:40,071 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 11:07:40,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:40,072 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:07:40,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:07:40,073 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:07:40,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:07:40,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:40,076 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:40,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:40,291 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:40,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:40,293 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 11:07:40,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:40,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623835017] [2020-07-20 11:07:40,295 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 11:07:40,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:40,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:07:40,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:07:40,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:40,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:40,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:40,759 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:07:40,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623835017] [2020-07-20 11:07:40,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:40,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:07:40,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698749608] [2020-07-20 11:07:40,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:07:40,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:40,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:07:40,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:07:40,765 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 11:07:40,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:40,990 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 11:07:40,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:07:40,991 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 11:07:40,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:40,994 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:07:40,995 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 11:07:40,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:07:40,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 11:07:41,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 11:07:41,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:07:41,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:07:41,011 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 11:07:41,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:41,012 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:07:41,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:07:41,012 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:07:41,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:07:41,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:41,016 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:41,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:41,232 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:41,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:41,233 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 11:07:41,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:41,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980331102] [2020-07-20 11:07:41,234 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 11:07:41,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:41,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:07:41,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:41,354 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:07:41,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:41,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:41,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:41,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:41,839 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:07:41,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980331102] [2020-07-20 11:07:41,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:41,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:07:41,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138051237] [2020-07-20 11:07:41,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:07:41,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:41,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:07:41,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:07:41,844 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 11:07:42,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:42,140 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 11:07:42,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:07:42,141 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 11:07:42,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:42,143 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:07:42,144 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 11:07:42,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:07:42,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 11:07:42,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 11:07:42,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:07:42,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:07:42,158 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 11:07:42,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:42,158 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:07:42,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:07:42,159 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:07:42,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 11:07:42,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:42,161 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:42,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:42,376 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:42,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:42,377 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 11:07:42,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:42,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912723648] [2020-07-20 11:07:42,379 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 11:07:42,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:42,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:07:42,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:42,478 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 11:07:42,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:42,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:42,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:42,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:42,890 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:07:42,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912723648] [2020-07-20 11:07:42,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:42,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:07:42,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193663943] [2020-07-20 11:07:42,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:07:42,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:42,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:07:42,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:07:42,895 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 11:07:43,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:43,109 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 11:07:43,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:07:43,119 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 11:07:43,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:43,125 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:07:43,129 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 11:07:43,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:07:43,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 11:07:43,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 11:07:43,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:07:43,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:07:43,168 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 11:07:43,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:43,169 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:07:43,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:07:43,170 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:07:43,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 11:07:43,179 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:43,179 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:43,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:43,395 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:43,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:43,396 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 11:07:43,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:43,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604240605] [2020-07-20 11:07:43,398 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 11:07:43,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:43,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:07:43,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:43,542 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 11:07:43,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:44,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:44,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:44,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:44,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:44,388 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:07:44,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604240605] [2020-07-20 11:07:44,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:44,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:07:44,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012007310] [2020-07-20 11:07:44,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:07:44,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:44,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:07:44,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:07:44,398 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 11:07:44,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:44,714 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 11:07:44,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:07:44,715 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 11:07:44,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:44,718 INFO L225 Difference]: With dead ends: 61 [2020-07-20 11:07:44,719 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 11:07:44,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:07:44,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 11:07:44,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 11:07:44,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:07:44,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:07:44,736 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 11:07:44,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:44,737 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:07:44,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:07:44,737 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:07:44,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 11:07:44,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:44,740 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:44,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:44,956 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:44,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:44,957 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 11:07:44,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:44,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477050633] [2020-07-20 11:07:44,959 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 11:07:45,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:45,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:07:45,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:45,120 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 11:07:45,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:45,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,801 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:07:45,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477050633] [2020-07-20 11:07:45,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:45,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:07:45,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340773114] [2020-07-20 11:07:45,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:07:45,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:45,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:07:45,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:07:45,807 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 13 states. [2020-07-20 11:07:46,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:46,127 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 11:07:46,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:07:46,129 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-20 11:07:46,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:46,132 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:07:46,132 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 11:07:46,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:07:46,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 11:07:46,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 11:07:46,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:07:46,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:07:46,150 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 11:07:46,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:46,151 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:07:46,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:07:46,151 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:07:46,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 11:07:46,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:46,154 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:46,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:46,369 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:46,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:46,370 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 11:07:46,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:46,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023944990] [2020-07-20 11:07:46,371 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 11:07:46,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:46,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:07:46,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 11:07:46,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:47,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,846 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 11:07:47,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023944990] [2020-07-20 11:07:47,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:47,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 11:07:47,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914725523] [2020-07-20 11:07:47,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:07:47,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:47,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:07:47,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:07:47,851 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 15 states. [2020-07-20 11:07:48,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:48,207 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 11:07:48,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:07:48,208 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2020-07-20 11:07:48,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:48,211 INFO L225 Difference]: With dead ends: 71 [2020-07-20 11:07:48,211 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 11:07:48,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:07:48,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 11:07:48,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 11:07:48,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 11:07:48,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 11:07:48,230 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 11:07:48,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:48,234 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 11:07:48,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:07:48,234 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 11:07:48,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 11:07:48,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:48,238 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:48,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:48,452 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:48,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:48,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 11:07:48,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:48,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475362230] [2020-07-20 11:07:48,454 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 11:07:48,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:48,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:07:48,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:48,634 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 79 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2020-07-20 11:07:48,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:49,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:49,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:49,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:49,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:49,459 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 83 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-07-20 11:07:49,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475362230] [2020-07-20 11:07:49,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:49,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:07:49,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541284858] [2020-07-20 11:07:49,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:07:49,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:49,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:07:49,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:07:49,467 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 13 states. [2020-07-20 11:07:49,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:49,713 INFO L93 Difference]: Finished difference Result 84 states and 164 transitions. [2020-07-20 11:07:49,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:07:49,719 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 108 [2020-07-20 11:07:49,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:49,722 INFO L225 Difference]: With dead ends: 84 [2020-07-20 11:07:49,722 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 11:07:49,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 196 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:07:49,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 11:07:49,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-07-20 11:07:49,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 11:07:49,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-20 11:07:49,746 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 108 [2020-07-20 11:07:49,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:49,748 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-20 11:07:49,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:07:49,748 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-20 11:07:49,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 11:07:49,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:49,751 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:49,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:49,966 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:49,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:49,967 INFO L82 PathProgramCache]: Analyzing trace with hash -60364660, now seen corresponding path program 1 times [2020-07-20 11:07:49,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:49,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654811065] [2020-07-20 11:07:49,968 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 11:07:50,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:50,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:07:50,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:50,139 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 11:07:50,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:50,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:50,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:50,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:50,769 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-07-20 11:07:50,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654811065] [2020-07-20 11:07:50,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:50,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 11:07:50,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799819742] [2020-07-20 11:07:50,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:07:50,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:50,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:07:50,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:07:50,774 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 11 states. [2020-07-20 11:07:50,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:50,951 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2020-07-20 11:07:50,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:07:50,952 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 109 [2020-07-20 11:07:50,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:50,955 INFO L225 Difference]: With dead ends: 79 [2020-07-20 11:07:50,955 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 11:07:50,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 202 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:07:50,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 11:07:50,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2020-07-20 11:07:50,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 11:07:50,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 85 transitions. [2020-07-20 11:07:50,974 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 85 transitions. Word has length 109 [2020-07-20 11:07:50,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:50,975 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 85 transitions. [2020-07-20 11:07:50,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:07:50,975 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 85 transitions. [2020-07-20 11:07:50,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 11:07:50,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:50,978 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:51,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:51,194 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:51,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:51,194 INFO L82 PathProgramCache]: Analyzing trace with hash 836558126, now seen corresponding path program 1 times [2020-07-20 11:07:51,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:51,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880273540] [2020-07-20 11:07:51,196 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 11:07:51,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:51,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:07:51,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:51,384 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 105 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-07-20 11:07:51,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:52,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,616 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 113 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 11:07:52,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880273540] [2020-07-20 11:07:52,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:52,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 11:07:52,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555327810] [2020-07-20 11:07:52,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:07:52,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:52,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:07:52,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:07:52,621 INFO L87 Difference]: Start difference. First operand 54 states and 85 transitions. Second operand 15 states. [2020-07-20 11:07:52,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:52,963 INFO L93 Difference]: Finished difference Result 94 states and 199 transitions. [2020-07-20 11:07:52,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:07:52,965 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 11:07:52,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:52,967 INFO L225 Difference]: With dead ends: 94 [2020-07-20 11:07:52,967 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 11:07:52,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:07:52,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 11:07:52,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-20 11:07:52,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 11:07:52,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 95 transitions. [2020-07-20 11:07:52,986 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 95 transitions. Word has length 135 [2020-07-20 11:07:52,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:52,987 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 95 transitions. [2020-07-20 11:07:52,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:07:52,987 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 95 transitions. [2020-07-20 11:07:52,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:07:52,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:52,992 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:53,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:53,209 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:53,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:53,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1608635723, now seen corresponding path program 2 times [2020-07-20 11:07:53,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:53,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839072808] [2020-07-20 11:07:53,211 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 11:07:53,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:53,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:07:53,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:53,403 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 78 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 11:07:53,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:53,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:53,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:54,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:54,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:54,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:54,263 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 82 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2020-07-20 11:07:54,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839072808] [2020-07-20 11:07:54,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:54,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:07:54,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330284318] [2020-07-20 11:07:54,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:07:54,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:54,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:07:54,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:07:54,268 INFO L87 Difference]: Start difference. First operand 62 states and 95 transitions. Second operand 13 states. [2020-07-20 11:07:54,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:54,518 INFO L93 Difference]: Finished difference Result 92 states and 161 transitions. [2020-07-20 11:07:54,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:07:54,520 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 11:07:54,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:54,522 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:07:54,522 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:07:54,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:07:54,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:07:54,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 65. [2020-07-20 11:07:54,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 11:07:54,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 103 transitions. [2020-07-20 11:07:54,539 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 103 transitions. Word has length 121 [2020-07-20 11:07:54,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:54,540 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 103 transitions. [2020-07-20 11:07:54,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:07:54,541 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 103 transitions. [2020-07-20 11:07:54,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-20 11:07:54,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:54,543 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:54,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:54,758 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:54,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:54,759 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-20 11:07:54,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:54,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938509741] [2020-07-20 11:07:54,761 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 11:07:54,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:54,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:07:54,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:54,916 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 11:07:54,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:55,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,438 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-20 11:07:55,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938509741] [2020-07-20 11:07:55,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:55,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 11:07:55,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215427408] [2020-07-20 11:07:55,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:07:55,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:55,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:07:55,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:07:55,444 INFO L87 Difference]: Start difference. First operand 65 states and 103 transitions. Second operand 11 states. [2020-07-20 11:07:55,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:55,644 INFO L93 Difference]: Finished difference Result 84 states and 140 transitions. [2020-07-20 11:07:55,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:07:55,645 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 95 [2020-07-20 11:07:55,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:55,647 INFO L225 Difference]: With dead ends: 84 [2020-07-20 11:07:55,648 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 11:07:55,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:07:55,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 11:07:55,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-20 11:07:55,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 11:07:55,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 122 transitions. [2020-07-20 11:07:55,662 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 122 transitions. Word has length 95 [2020-07-20 11:07:55,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:55,663 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 122 transitions. [2020-07-20 11:07:55,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:07:55,664 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 122 transitions. [2020-07-20 11:07:55,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 11:07:55,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:55,667 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:55,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:55,881 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:55,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:55,882 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 4 times [2020-07-20 11:07:55,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:55,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334076222] [2020-07-20 11:07:55,884 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 11:07:55,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:55,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:07:55,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:56,042 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 83 proven. 24 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 11:07:56,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:56,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,842 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 85 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 11:07:56,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334076222] [2020-07-20 11:07:56,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:56,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:07:56,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870680671] [2020-07-20 11:07:56,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:07:56,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:56,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:07:56,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:07:56,854 INFO L87 Difference]: Start difference. First operand 72 states and 122 transitions. Second operand 13 states. [2020-07-20 11:07:57,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:57,103 INFO L93 Difference]: Finished difference Result 92 states and 158 transitions. [2020-07-20 11:07:57,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:07:57,104 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 107 [2020-07-20 11:07:57,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:57,107 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:07:57,107 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 11:07:57,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:07:57,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 11:07:57,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2020-07-20 11:07:57,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 11:07:57,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 11:07:57,124 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 107 [2020-07-20 11:07:57,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:57,125 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 11:07:57,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:07:57,125 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 11:07:57,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 11:07:57,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:57,128 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:57,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:57,344 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:57,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:57,345 INFO L82 PathProgramCache]: Analyzing trace with hash 235412830, now seen corresponding path program 5 times [2020-07-20 11:07:57,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:57,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987567757] [2020-07-20 11:07:57,347 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 11:07:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:57,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:07:57,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:57,508 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 19 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2020-07-20 11:07:57,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:57,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:57,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:57,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:57,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:57,969 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 20 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 11:07:57,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987567757] [2020-07-20 11:07:57,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:57,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 11:07:57,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464542719] [2020-07-20 11:07:57,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:07:57,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:57,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:07:57,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:07:57,973 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 11 states. [2020-07-20 11:07:58,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:58,157 INFO L93 Difference]: Finished difference Result 91 states and 155 transitions. [2020-07-20 11:07:58,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:07:58,159 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 108 [2020-07-20 11:07:58,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:58,162 INFO L225 Difference]: With dead ends: 91 [2020-07-20 11:07:58,162 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 11:07:58,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:07:58,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 11:07:58,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2020-07-20 11:07:58,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 11:07:58,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 11:07:58,178 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 108 [2020-07-20 11:07:58,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:58,179 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 11:07:58,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:07:58,180 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 11:07:58,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 11:07:58,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:58,184 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:58,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:58,400 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:58,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:58,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-20 11:07:58,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:58,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073771715] [2020-07-20 11:07:58,402 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 11:07:58,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:58,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 11:07:58,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:58,935 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 11:07:58,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:00,211 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 11:08:00,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073771715] [2020-07-20 11:08:00,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:00,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-20 11:08:00,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494760454] [2020-07-20 11:08:00,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 11:08:00,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:00,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 11:08:00,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-20 11:08:00,216 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 28 states. [2020-07-20 11:08:00,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:00,851 INFO L93 Difference]: Finished difference Result 148 states and 317 transitions. [2020-07-20 11:08:00,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 11:08:00,852 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2020-07-20 11:08:00,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:00,855 INFO L225 Difference]: With dead ends: 148 [2020-07-20 11:08:00,856 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 11:08:00,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=797, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:08:00,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 11:08:00,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 107. [2020-07-20 11:08:00,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 11:08:00,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 226 transitions. [2020-07-20 11:08:00,888 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 226 transitions. Word has length 109 [2020-07-20 11:08:00,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:00,889 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 226 transitions. [2020-07-20 11:08:00,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 11:08:00,889 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 226 transitions. [2020-07-20 11:08:00,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-07-20 11:08:00,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:00,894 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:01,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:01,108 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:01,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:01,109 INFO L82 PathProgramCache]: Analyzing trace with hash -706406608, now seen corresponding path program 7 times [2020-07-20 11:08:01,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:01,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [37348082] [2020-07-20 11:08:01,110 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 11:08:01,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:01,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:08:01,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:01,281 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 60 proven. 98 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2020-07-20 11:08:01,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:01,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:01,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:01,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:01,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:01,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:02,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:02,078 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 62 proven. 100 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2020-07-20 11:08:02,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [37348082] [2020-07-20 11:08:02,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:02,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:08:02,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281032836] [2020-07-20 11:08:02,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:08:02,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:02,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:08:02,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:08:02,091 INFO L87 Difference]: Start difference. First operand 107 states and 226 transitions. Second operand 13 states. [2020-07-20 11:08:02,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:02,407 INFO L93 Difference]: Finished difference Result 156 states and 384 transitions. [2020-07-20 11:08:02,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:08:02,408 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 137 [2020-07-20 11:08:02,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:02,413 INFO L225 Difference]: With dead ends: 156 [2020-07-20 11:08:02,413 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 11:08:02,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 253 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:08:02,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 11:08:02,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 107. [2020-07-20 11:08:02,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 11:08:02,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 226 transitions. [2020-07-20 11:08:02,443 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 226 transitions. Word has length 137 [2020-07-20 11:08:02,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:02,444 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 226 transitions. [2020-07-20 11:08:02,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:08:02,444 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 226 transitions. [2020-07-20 11:08:02,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 11:08:02,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:02,448 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:02,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:02,664 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:02,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:02,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1521075862, now seen corresponding path program 8 times [2020-07-20 11:08:02,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:02,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573851173] [2020-07-20 11:08:02,667 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 11:08:02,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:02,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:08:02,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 96 proven. 18 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2020-07-20 11:08:02,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:03,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:03,647 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 96 proven. 24 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 11:08:03,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573851173] [2020-07-20 11:08:03,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:03,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 11:08:03,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647268573] [2020-07-20 11:08:03,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:08:03,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:03,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:08:03,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:08:03,651 INFO L87 Difference]: Start difference. First operand 107 states and 226 transitions. Second operand 13 states. [2020-07-20 11:08:03,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:03,943 INFO L93 Difference]: Finished difference Result 138 states and 295 transitions. [2020-07-20 11:08:03,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:08:03,944 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 110 [2020-07-20 11:08:03,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:03,949 INFO L225 Difference]: With dead ends: 138 [2020-07-20 11:08:03,949 INFO L226 Difference]: Without dead ends: 134 [2020-07-20 11:08:03,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 199 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:08:03,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-20 11:08:03,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 114. [2020-07-20 11:08:03,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-20 11:08:03,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 257 transitions. [2020-07-20 11:08:03,975 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 257 transitions. Word has length 110 [2020-07-20 11:08:03,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:03,976 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 257 transitions. [2020-07-20 11:08:03,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:08:03,976 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 257 transitions. [2020-07-20 11:08:03,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:08:03,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:03,982 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:04,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:04,195 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:04,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:04,196 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 9 times [2020-07-20 11:08:04,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:04,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475032371] [2020-07-20 11:08:04,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 11:08:04,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:04,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:08:04,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:04,529 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 112 proven. 26 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 11:08:04,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:05,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,560 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 111 proven. 31 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 11:08:05,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475032371] [2020-07-20 11:08:05,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:05,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 11:08:05,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474621088] [2020-07-20 11:08:05,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:08:05,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:05,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:08:05,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:08:05,568 INFO L87 Difference]: Start difference. First operand 114 states and 257 transitions. Second operand 15 states. [2020-07-20 11:08:06,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:06,017 INFO L93 Difference]: Finished difference Result 147 states and 340 transitions. [2020-07-20 11:08:06,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:08:06,019 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 11:08:06,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:06,025 INFO L225 Difference]: With dead ends: 147 [2020-07-20 11:08:06,025 INFO L226 Difference]: Without dead ends: 143 [2020-07-20 11:08:06,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:08:06,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-07-20 11:08:06,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 102. [2020-07-20 11:08:06,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 11:08:06,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 216 transitions. [2020-07-20 11:08:06,057 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 216 transitions. Word has length 121 [2020-07-20 11:08:06,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:06,058 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 216 transitions. [2020-07-20 11:08:06,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:08:06,059 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 216 transitions. [2020-07-20 11:08:06,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:08:06,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:06,066 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:06,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:06,281 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:06,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:06,282 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 10 times [2020-07-20 11:08:06,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:06,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165204831] [2020-07-20 11:08:06,284 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 11:08:06,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:06,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 11:08:06,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:06,544 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 87 proven. 22 refuted. 0 times theorem prover too weak. 237 trivial. 0 not checked. [2020-07-20 11:08:06,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:07,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:07,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:07,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:07,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:07,279 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 86 proven. 24 refuted. 0 times theorem prover too weak. 236 trivial. 0 not checked. [2020-07-20 11:08:07,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165204831] [2020-07-20 11:08:07,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:07,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-20 11:08:07,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33252208] [2020-07-20 11:08:07,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:08:07,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:07,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:08:07,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:08:07,282 INFO L87 Difference]: Start difference. First operand 102 states and 216 transitions. Second operand 13 states. [2020-07-20 11:08:07,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:07,594 INFO L93 Difference]: Finished difference Result 128 states and 276 transitions. [2020-07-20 11:08:07,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:08:07,595 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 11:08:07,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:07,599 INFO L225 Difference]: With dead ends: 128 [2020-07-20 11:08:07,599 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 11:08:07,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:08:07,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 11:08:07,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2020-07-20 11:08:07,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 11:08:07,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 184 transitions. [2020-07-20 11:08:07,627 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 184 transitions. Word has length 121 [2020-07-20 11:08:07,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:07,631 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 184 transitions. [2020-07-20 11:08:07,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:08:07,631 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 184 transitions. [2020-07-20 11:08:07,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:08:07,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:07,635 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:07,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:07,850 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:07,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:07,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1853548191, now seen corresponding path program 11 times [2020-07-20 11:08:07,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:07,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781725701] [2020-07-20 11:08:07,852 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 11:08:07,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:07,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:08:07,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:08,078 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 67 proven. 71 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 11:08:08,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:08,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:09,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:09,074 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 66 proven. 76 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 11:08:09,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781725701] [2020-07-20 11:08:09,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:09,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 11:08:09,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245195086] [2020-07-20 11:08:09,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:08:09,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:09,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:08:09,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:08:09,077 INFO L87 Difference]: Start difference. First operand 94 states and 184 transitions. Second operand 15 states. [2020-07-20 11:08:09,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:09,413 INFO L93 Difference]: Finished difference Result 126 states and 280 transitions. [2020-07-20 11:08:09,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:08:09,418 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 11:08:09,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:09,420 INFO L225 Difference]: With dead ends: 126 [2020-07-20 11:08:09,421 INFO L226 Difference]: Without dead ends: 94 [2020-07-20 11:08:09,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:08:09,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-20 11:08:09,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2020-07-20 11:08:09,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 11:08:09,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 147 transitions. [2020-07-20 11:08:09,435 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 147 transitions. Word has length 121 [2020-07-20 11:08:09,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:09,435 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 147 transitions. [2020-07-20 11:08:09,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:08:09,436 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 147 transitions. [2020-07-20 11:08:09,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 11:08:09,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:09,438 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:09,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:09,653 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:09,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:09,654 INFO L82 PathProgramCache]: Analyzing trace with hash 250703466, now seen corresponding path program 1 times [2020-07-20 11:08:09,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:09,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386023905] [2020-07-20 11:08:09,655 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 11:08:09,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:09,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:08:09,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:09,861 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 96 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-07-20 11:08:09,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:10,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:10,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:10,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:10,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:10,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:11,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:11,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:11,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:11,121 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 38 proven. 102 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-07-20 11:08:11,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386023905] [2020-07-20 11:08:11,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:11,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 11:08:11,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16904457] [2020-07-20 11:08:11,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:08:11,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:11,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:08:11,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:08:11,125 INFO L87 Difference]: Start difference. First operand 81 states and 147 transitions. Second operand 15 states. [2020-07-20 11:08:11,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:11,472 INFO L93 Difference]: Finished difference Result 124 states and 266 transitions. [2020-07-20 11:08:11,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:08:11,473 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 110 [2020-07-20 11:08:11,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:11,476 INFO L225 Difference]: With dead ends: 124 [2020-07-20 11:08:11,477 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 11:08:11,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 195 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:08:11,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 11:08:11,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 11:08:11,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 11:08:11,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2020-07-20 11:08:11,491 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 110 [2020-07-20 11:08:11,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:11,491 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2020-07-20 11:08:11,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:08:11,491 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2020-07-20 11:08:11,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:08:11,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:11,495 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:11,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:11,711 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:11,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:11,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 12 times [2020-07-20 11:08:11,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:11,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182937953] [2020-07-20 11:08:11,713 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 11:08:11,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:11,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 11:08:11,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:11,957 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 50 proven. 107 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2020-07-20 11:08:11,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:12,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:12,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:13,417 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 48 proven. 117 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-07-20 11:08:13,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182937953] [2020-07-20 11:08:13,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:13,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 11:08:13,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517403098] [2020-07-20 11:08:13,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:08:13,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:13,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:08:13,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:08:13,424 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand 17 states. [2020-07-20 11:08:13,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:13,938 INFO L93 Difference]: Finished difference Result 129 states and 200 transitions. [2020-07-20 11:08:13,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:08:13,939 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 121 [2020-07-20 11:08:13,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:13,942 INFO L225 Difference]: With dead ends: 129 [2020-07-20 11:08:13,942 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 11:08:13,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 215 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:08:13,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 11:08:13,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 11:08:13,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 11:08:13,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2020-07-20 11:08:13,955 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 121 [2020-07-20 11:08:13,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:13,956 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2020-07-20 11:08:13,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:08:13,957 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2020-07-20 11:08:13,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:08:13,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:13,960 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:14,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:14,174 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:14,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:14,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1847656481, now seen corresponding path program 13 times [2020-07-20 11:08:14,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:14,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701040210] [2020-07-20 11:08:14,176 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 11:08:14,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:14,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:08:14,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:14,407 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 52 proven. 86 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 11:08:14,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:15,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:15,614 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 53 proven. 89 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 11:08:15,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701040210] [2020-07-20 11:08:15,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:15,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 11:08:15,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780174395] [2020-07-20 11:08:15,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:08:15,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:15,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:08:15,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:08:15,618 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 15 states. [2020-07-20 11:08:15,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:15,907 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2020-07-20 11:08:15,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:08:15,908 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 11:08:15,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:15,909 INFO L225 Difference]: With dead ends: 61 [2020-07-20 11:08:15,909 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:08:15,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:08:15,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:08:15,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:08:15,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:08:15,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:08:15,912 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-20 11:08:15,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:15,912 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:08:15,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:08:15,913 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:08:15,913 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:08:16,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:16,126 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:08:16,712 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 32 [2020-07-20 11:08:17,136 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 45 [2020-07-20 11:08:18,515 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:18,624 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:18,730 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:18,833 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:18,966 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:19,385 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 43 [2020-07-20 11:08:19,671 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:19,797 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 32 [2020-07-20 11:08:19,904 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 35 [2020-07-20 11:08:20,301 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 21 [2020-07-20 11:08:20,753 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 24 [2020-07-20 11:08:20,760 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 11:08:20,761 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:08:20,761 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:08:20,761 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 11:08:20,761 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 11:08:20,761 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 11:08:20,762 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 11:08:20,762 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 11:08:20,762 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 11:08:20,762 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 11:08:20,762 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 11:08:20,762 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 11:08:20,763 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-20 11:08:20,763 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 11:08:20,763 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 11:08:20,763 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 11:08:20,763 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 11:08:20,763 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (or (<= 5 |fibo2_#in~n|) (and (<= 4 |fibo2_#in~n|) (= 2 |fibo2_#t~ret2|)) (and (= 1 |fibo2_#t~ret2|) (<= |fibo2_#in~n| 3))) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 11:08:20,764 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 11:08:20,764 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 11:08:20,765 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 11:08:20,765 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|))) (or (and .cse0 (<= 4 |fibo1_#in~n|)) (and (<= 2 |fibo1_#in~n|) .cse0 (= 1 |fibo1_#t~ret0|)))) (let ((.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= 6 |fibo1_#in~n|) .cse1) (and (= 3 |fibo1_#t~ret0|) .cse1) (and (<= |fibo1_#in~n| 4) .cse1)))) [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 11:08:20,765 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 11:08:20,775 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:08:20 BoogieIcfgContainer [2020-07-20 11:08:20,775 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:08:20,778 INFO L168 Benchmark]: Toolchain (without parser) took 44674.08 ms. Allocated memory was 136.8 MB in the beginning and 458.8 MB in the end (delta: 321.9 MB). Free memory was 101.9 MB in the beginning and 257.7 MB in the end (delta: -155.8 MB). Peak memory consumption was 341.1 MB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,779 INFO L168 Benchmark]: CDTParser took 0.55 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,780 INFO L168 Benchmark]: CACSL2BoogieTranslator took 503.25 ms. Allocated memory is still 136.8 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,780 INFO L168 Benchmark]: Boogie Preprocessor took 253.14 ms. Allocated memory was 136.8 MB in the beginning and 205.5 MB in the end (delta: 68.7 MB). Free memory was 91.9 MB in the beginning and 184.2 MB in the end (delta: -92.3 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,781 INFO L168 Benchmark]: RCFGBuilder took 468.22 ms. Allocated memory is still 205.5 MB. Free memory was 184.2 MB in the beginning and 171.0 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,782 INFO L168 Benchmark]: TraceAbstraction took 43435.93 ms. Allocated memory was 205.5 MB in the beginning and 458.8 MB in the end (delta: 253.2 MB). Free memory was 171.0 MB in the beginning and 257.7 MB in the end (delta: -86.6 MB). Peak memory consumption was 341.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:08:20,785 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.55 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 503.25 ms. Allocated memory is still 136.8 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 253.14 ms. Allocated memory was 136.8 MB in the beginning and 205.5 MB in the end (delta: 68.7 MB). Free memory was 91.9 MB in the beginning and 184.2 MB in the end (delta: -92.3 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 468.22 ms. Allocated memory is still 205.5 MB. Free memory was 184.2 MB in the beginning and 171.0 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 43435.93 ms. Allocated memory was 205.5 MB in the beginning and 458.8 MB in the end (delta: 253.2 MB). Free memory was 171.0 MB in the beginning and 257.7 MB in the end (delta: -86.6 MB). Peak memory consumption was 341.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: 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 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 38.5s, OverallIterations: 25, TraceHistogramMax: 11, AutomataDifference: 7.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 707 SDtfs, 791 SDslu, 4724 SDs, 0 SdLazy, 3888 SolverSat, 554 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4445 GetRequests, 3901 SyntacticMatches, 181 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 6.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=114occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 25 MinimizatonAttempts, 340 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 134 PreInvPairs, 1204 NumberOfFragments, 102 HoareAnnotationTreeSize, 134 FomulaSimplifications, 3894644 FormulaSimplificationTreeSizeReduction, 3.7s HoareSimplificationTime, 11 FomulaSimplificationsInter, 2083 FormulaSimplificationTreeSizeReductionInter, 0.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 22.2s InterpolantComputationTime, 2197 NumberOfCodeBlocks, 2197 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 4319 ConstructedInterpolants, 0 QuantifiedInterpolants, 827309 SizeOfPredicates, 108 NumberOfNonLiveVariables, 4908 ConjunctsInSsa, 284 ConjunctsInUnsatCore, 48 InterpolantComputations, 2 PerfectInterpolantSequences, 8076/10394 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...