/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_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:00:22,410 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:00:22,413 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:00:22,424 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:00:22,425 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:00:22,426 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:00:22,427 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:00:22,429 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:00:22,430 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:00:22,431 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:00:22,432 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:00:22,433 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:00:22,434 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:00:22,435 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:00:22,436 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:00:22,437 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:00:22,437 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:00:22,438 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:00:22,440 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:00:22,442 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:00:22,443 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:00:22,444 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:00:22,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:00:22,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:00:22,451 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:00:22,462 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:00:22,463 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:00:22,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:00:22,468 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 11:00:22,493 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:00:22,493 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:00:22,494 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:00:22,494 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:00:22,495 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:00:22,495 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:00:22,495 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:00:22,495 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:00:22,496 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:00:22,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:00:22,497 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:00:22,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:00:22,497 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:00:22,498 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:00:22,498 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:00:22,498 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:00:22,498 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:00:22,498 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:00:22,499 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:00:22,499 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:00:22,499 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:00:22,499 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:22,499 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:00:22,499 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:00:22,500 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:00:22,500 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:00:22,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:22,500 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:00:22,500 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:00:22,501 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 11:00:22,769 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:00:22,782 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:00:22,785 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:00:22,786 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:00:22,787 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:00:22,787 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 11:00:22,859 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0bda334e/8ad2e8fefa8345b59d0dd3c933c2c5e0/FLAGe7b8ec170 [2020-07-20 11:00:23,314 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:00:23,314 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 11:00:23,321 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0bda334e/8ad2e8fefa8345b59d0dd3c933c2c5e0/FLAGe7b8ec170 [2020-07-20 11:00:23,700 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0bda334e/8ad2e8fefa8345b59d0dd3c933c2c5e0 [2020-07-20 11:00:23,711 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:23,714 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:23,715 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:23,715 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:23,718 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:23,719 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,722 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e10ba91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23, skipping insertion in model container [2020-07-20 11:00:23,722 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,730 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:23,750 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:23,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:23,905 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:23,919 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:23,931 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:23,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23 WrapperNode [2020-07-20 11:00:23,932 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:23,933 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:23,933 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:23,933 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:23,944 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,945 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,950 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,950 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:24,041 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:24,044 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:24,045 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:24,046 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:24,047 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:24,047 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:24,047 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:24,048 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (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 11:00:24,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:24,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:24,111 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 11:00:24,111 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 11:00:24,112 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:24,112 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:24,112 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:24,112 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 11:00:24,113 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 11:00:24,113 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:24,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:24,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:24,298 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:24,298 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:24,302 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:24 BoogieIcfgContainer [2020-07-20 11:00:24,302 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:24,303 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:24,303 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:24,306 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:24,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:23" (1/3) ... [2020-07-20 11:00:24,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e6f6a16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:24, skipping insertion in model container [2020-07-20 11:00:24,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (2/3) ... [2020-07-20 11:00:24,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e6f6a16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:24, skipping insertion in model container [2020-07-20 11:00:24,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:24" (3/3) ... [2020-07-20 11:00:24,310 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-2.c [2020-07-20 11:00:24,320 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:24,327 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:24,341 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:24,365 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:24,366 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:24,366 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:24,366 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:24,366 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:24,366 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:24,367 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:24,367 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:24,387 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:00:24,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:24,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,395 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,396 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 11:00:24,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688790755] [2020-07-20 11:00:24,412 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 11:00:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:24,611 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 11:00:24,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:24,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688790755] [2020-07-20 11:00:24,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:24,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:24,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003055779] [2020-07-20 11:00:24,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:24,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:24,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:24,633 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 11:00:24,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,751 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 11:00:24,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:24,753 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:24,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,763 INFO L225 Difference]: With dead ends: 44 [2020-07-20 11:00:24,763 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:00:24,767 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 11:00:24,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:00:24,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 11:00:24,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:00:24,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:00:24,808 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 11:00:24,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:24,808 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:00:24,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:24,809 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:00:24,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:24,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,811 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:25,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,024 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 11:00:25,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967595381] [2020-07-20 11:00:25,027 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 11:00:25,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,099 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 11:00:25,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:25,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967595381] [2020-07-20 11:00:25,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:25,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:25,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219900457] [2020-07-20 11:00:25,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:25,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:25,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:25,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:25,104 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 11:00:25,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:25,181 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 11:00:25,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:25,182 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:25,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:25,184 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:00:25,184 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 11:00:25,185 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 11:00:25,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 11:00:25,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 11:00:25,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:00:25,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:00:25,195 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 11:00:25,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,196 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:00:25,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:25,196 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:00:25,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:25,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,199 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 11:00:25,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,414 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 11:00:25,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321257127] [2020-07-20 11:00:25,418 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 11:00:25,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,531 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 11:00:25,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:25,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,791 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 11:00:25,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321257127] [2020-07-20 11:00:25,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:25,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:00:25,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282264651] [2020-07-20 11:00:25,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:00:25,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:25,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:00:25,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:00:25,794 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 11:00:25,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:25,946 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 11:00:25,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:25,947 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 11:00:25,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:25,949 INFO L225 Difference]: With dead ends: 41 [2020-07-20 11:00:25,950 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:00:25,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:25,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:00:25,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 11:00:25,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:00:25,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:00:25,971 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 11:00:25,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,975 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:00:25,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:00:25,975 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:00:25,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:25,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,978 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 11:00:26,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,192 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,193 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 11:00:26,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292711766] [2020-07-20 11:00:26,194 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) [2020-07-20 11:00:26,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,281 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 11:00:26,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:26,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,469 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 11:00:26,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292711766] [2020-07-20 11:00:26,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:26,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:00:26,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187694689] [2020-07-20 11:00:26,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:00:26,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:26,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:00:26,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:00:26,472 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 11:00:26,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,580 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 11:00:26,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:26,581 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 11:00:26,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,583 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:00:26,583 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 11:00:26,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:26,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 11:00:26,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 11:00:26,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:00:26,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:00:26,593 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 11:00:26,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,593 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:00:26,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:00:26,594 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:00:26,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:26,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,596 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 11:00:26,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,809 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,810 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 11:00:26,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168377920] [2020-07-20 11:00:26,812 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 11:00:26,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:26,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,904 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 11:00:26,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:27,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,287 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 11:00:27,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168377920] [2020-07-20 11:00:27,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:27,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:00:27,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664062091] [2020-07-20 11:00:27,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:00:27,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:27,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:00:27,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:27,290 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 11:00:27,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:27,457 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 11:00:27,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:27,458 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 11:00:27,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:27,460 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:00:27,460 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 11:00:27,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 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 11:00:27,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 11:00:27,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 11:00:27,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:00:27,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:00:27,470 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 11:00:27,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:27,471 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:00:27,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:00:27,471 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:00:27,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 11:00:27,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:27,473 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 11:00:27,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,688 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:27,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:27,688 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 11:00:27,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:27,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297107365] [2020-07-20 11:00:27,690 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 11:00:27,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:27,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:27,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:27,765 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 11:00:27,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:27,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,070 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 11:00:28,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297107365] [2020-07-20 11:00:28,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:28,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:00:28,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588836576] [2020-07-20 11:00:28,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:00:28,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:28,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:00:28,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:28,073 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 11:00:28,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:28,239 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 11:00:28,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:28,245 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 11:00:28,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:28,249 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:00:28,249 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 11:00:28,250 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 11:00:28,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 11:00:28,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 11:00:28,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:00:28,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:00:28,271 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 11:00:28,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:28,272 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:00:28,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:00:28,276 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:00:28,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 11:00:28,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:28,280 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 11:00:28,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:28,482 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:28,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:28,483 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 11:00:28,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:28,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884121012] [2020-07-20 11:00:28,484 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 11:00:28,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:28,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:28,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:28,600 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 11:00:28,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:28,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:29,167 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 11:00:29,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884121012] [2020-07-20 11:00:29,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:29,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:00:29,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678333927] [2020-07-20 11:00:29,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:00:29,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:29,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:00:29,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:29,171 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 11:00:29,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:29,363 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 11:00:29,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:29,364 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 11:00:29,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:29,366 INFO L225 Difference]: With dead ends: 61 [2020-07-20 11:00:29,366 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 11:00:29,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:29,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 11:00:29,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 11:00:29,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:00:29,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:00:29,378 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 11:00:29,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:29,378 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:00:29,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:00:29,378 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:00:29,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 11:00:29,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:29,381 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 11:00:29,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,591 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:29,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:29,591 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 11:00:29,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:29,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859310394] [2020-07-20 11:00:29,593 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 11:00:29,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:29,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:29,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:29,686 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 11:00:29,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:30,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,199 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 11:00:30,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859310394] [2020-07-20 11:00:30,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:30,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:00:30,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950953121] [2020-07-20 11:00:30,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:00:30,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:30,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:00:30,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:30,202 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 11:00:30,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:30,398 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 11:00:30,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:30,399 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 11:00:30,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:30,402 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:00:30,402 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 11:00:30,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:30,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 11:00:30,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 11:00:30,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:00:30,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:00:30,414 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 11:00:30,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:30,415 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:00:30,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:00:30,415 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:00:30,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 11:00:30,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:30,418 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 11:00:30,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:30,620 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:30,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:30,621 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 11:00:30,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:30,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23917673] [2020-07-20 11:00:30,623 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 11:00:30,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:30,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:30,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:30,776 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 11:00:30,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:31,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,658 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 11:00:31,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23917673] [2020-07-20 11:00:31,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:31,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 11:00:31,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515424120] [2020-07-20 11:00:31,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:00:31,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:31,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:00:31,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:00:31,660 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 11:00:31,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:31,895 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 11:00:31,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:31,896 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 11:00:31,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:31,898 INFO L225 Difference]: With dead ends: 71 [2020-07-20 11:00:31,898 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 11:00:31,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:31,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 11:00:31,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 11:00:31,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 11:00:31,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 11:00:31,911 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 11:00:31,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:31,912 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 11:00:31,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:00:31,912 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 11:00:31,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 11:00:31,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:31,914 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 11:00:32,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,130 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:32,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:32,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 11:00:32,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:32,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929314620] [2020-07-20 11:00:32,132 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 11:00:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:32,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:32,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:32,270 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 11:00:32,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:32,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,199 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 11:00:33,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929314620] [2020-07-20 11:00:33,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:33,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 11:00:33,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691892894] [2020-07-20 11:00:33,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:00:33,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:33,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:00:33,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:00:33,202 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 11:00:33,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:33,418 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 11:00:33,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:33,418 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 11:00:33,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:33,420 INFO L225 Difference]: With dead ends: 76 [2020-07-20 11:00:33,420 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 11:00:33,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:33,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 11:00:33,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 11:00:33,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 11:00:33,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 11:00:33,446 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 11:00:33,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:33,447 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 11:00:33,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:00:33,447 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 11:00:33,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 11:00:33,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:33,453 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:33,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:33,660 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:33,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:33,661 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 11:00:33,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:33,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497428075] [2020-07-20 11:00:33,663 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 11:00:33,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:33,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:33,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:33,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 11:00:33,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:34,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 11:00:35,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497428075] [2020-07-20 11:00:35,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:35,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 11:00:35,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356889652] [2020-07-20 11:00:35,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:00:35,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:35,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:00:35,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:35,563 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 11:00:35,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:35,830 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 11:00:35,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:35,831 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 11:00:35,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:35,833 INFO L225 Difference]: With dead ends: 81 [2020-07-20 11:00:35,833 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 11:00:35,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:35,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 11:00:35,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 11:00:35,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 11:00:35,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 11:00:35,843 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 11:00:35,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:35,844 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 11:00:35,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:00:35,844 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 11:00:35,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:00:35,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:35,846 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:36,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,060 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:36,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:36,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 11:00:36,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:36,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926863004] [2020-07-20 11:00:36,061 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 11:00:36,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:36,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:36,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:36,212 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 11:00:36,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:37,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,587 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 11:00:37,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926863004] [2020-07-20 11:00:37,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:37,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 11:00:37,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697518809] [2020-07-20 11:00:37,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:00:37,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:37,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:00:37,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:37,591 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 11:00:37,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:37,849 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 11:00:37,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:37,853 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 11:00:37,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:37,855 INFO L225 Difference]: With dead ends: 86 [2020-07-20 11:00:37,856 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 11:00:37,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:37,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 11:00:37,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 11:00:37,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 11:00:37,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 11:00:37,873 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 11:00:37,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:37,874 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 11:00:37,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:00:37,875 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 11:00:37,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 11:00:37,878 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:37,878 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:38,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:38,092 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:38,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:38,093 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 11:00:38,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:38,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877891187] [2020-07-20 11:00:38,094 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 11:00:38,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:38,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:38,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:38,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 11:00:38,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:39,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:39,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 11:00:40,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877891187] [2020-07-20 11:00:40,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:40,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 11:00:40,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395536259] [2020-07-20 11:00:40,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:00:40,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:40,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:00:40,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:40,558 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 11:00:40,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:40,941 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 11:00:40,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:40,942 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 11:00:40,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:40,945 INFO L225 Difference]: With dead ends: 91 [2020-07-20 11:00:40,945 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 11:00:40,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:00:40,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 11:00:40,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 11:00:40,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:00:40,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 11:00:40,956 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 11:00:40,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:40,957 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 11:00:40,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:00:40,957 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 11:00:40,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 11:00:40,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:40,960 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:41,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:41,174 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:41,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:41,175 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 11:00:41,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:41,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115707718] [2020-07-20 11:00:41,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 11:00:41,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:41,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:41,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:41,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 11:00:41,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:42,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 11:00:43,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115707718] [2020-07-20 11:00:43,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:43,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 11:00:43,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300630996] [2020-07-20 11:00:43,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:00:43,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:43,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:00:43,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:43,791 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 11:00:44,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:44,138 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 11:00:44,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:44,139 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 11:00:44,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:44,141 INFO L225 Difference]: With dead ends: 96 [2020-07-20 11:00:44,141 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 11:00:44,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:00:44,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 11:00:44,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 11:00:44,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:00:44,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 11:00:44,153 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 11:00:44,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:44,153 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 11:00:44,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:00:44,154 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 11:00:44,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 11:00:44,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:44,161 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:44,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:44,375 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:44,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:44,376 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 11:00:44,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:44,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306848309] [2020-07-20 11:00:44,376 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 11:00:44,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:44,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:44,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:44,763 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 11:00:44,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:46,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:46,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,426 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 11:00:48,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306848309] [2020-07-20 11:00:48,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:48,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 11:00:48,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47456559] [2020-07-20 11:00:48,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:00:48,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:48,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:00:48,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:00:48,429 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 11:00:48,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:48,886 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 11:00:48,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:00:48,887 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 11:00:48,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:48,891 INFO L225 Difference]: With dead ends: 101 [2020-07-20 11:00:48,891 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 11:00:48,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:00:48,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 11:00:48,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 11:00:48,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 11:00:48,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 11:00:48,909 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 11:00:48,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:48,910 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 11:00:48,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:00:48,911 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 11:00:48,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 11:00:48,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:48,915 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:49,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,130 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:49,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:49,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 11:00:49,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:49,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101465776] [2020-07-20 11:00:49,131 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 11:00:49,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:49,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:49,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:49,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 11:00:49,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:51,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:51,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 11:00:53,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101465776] [2020-07-20 11:00:53,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:53,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 11:00:53,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273730196] [2020-07-20 11:00:53,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:00:53,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:53,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:00:53,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:00:53,467 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 11:00:53,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:53,912 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 11:00:53,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:00:53,913 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 11:00:53,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:53,916 INFO L225 Difference]: With dead ends: 106 [2020-07-20 11:00:53,916 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 11:00:53,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:00:53,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 11:00:53,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 11:00:53,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 11:00:53,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 11:00:53,938 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 11:00:53,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:53,940 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 11:00:53,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:00:53,940 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 11:00:53,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 11:00:53,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:53,948 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:54,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:54,164 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:54,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:54,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 11:00:54,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:54,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537859229] [2020-07-20 11:00:54,165 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 11:00:54,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:54,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 1829 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:00:54,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:54,972 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 11:00:54,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:58,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:59,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:00,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:00,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,995 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 11:01:01,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537859229] [2020-07-20 11:01:01,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:01,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 11:01:01,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273524518] [2020-07-20 11:01:01,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:01:01,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:01,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:01:01,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:01:01,998 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 11:01:02,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:02,575 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 11:01:02,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:02,576 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 11:01:02,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:02,580 INFO L225 Difference]: With dead ends: 111 [2020-07-20 11:01:02,580 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 11:01:02,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:01:02,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 11:01:02,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 11:01:02,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 11:01:02,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 11:01:02,598 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 11:01:02,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:02,599 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 11:01:02,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:01:02,599 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 11:01:02,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 11:01:02,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:02,602 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:02,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:02,817 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:02,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:02,818 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 11:01:02,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:02,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370231882] [2020-07-20 11:01:02,819 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 11:01:03,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:03,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:03,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:03,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 11:01:03,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:05,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:06,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:06,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 11:01:08,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370231882] [2020-07-20 11:01:08,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:08,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:01:08,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874962029] [2020-07-20 11:01:08,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:08,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:08,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:08,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:08,536 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 11:01:09,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:09,039 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 11:01:09,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:09,040 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 11:01:09,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:09,043 INFO L225 Difference]: With dead ends: 116 [2020-07-20 11:01:09,043 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 11:01:09,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:09,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 11:01:09,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 11:01:09,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 11:01:09,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 11:01:09,055 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 11:01:09,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:09,056 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 11:01:09,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:09,056 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 11:01:09,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 11:01:09,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:09,062 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:09,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:09,276 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:09,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:09,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 11:01:09,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:09,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915765864] [2020-07-20 11:01:09,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 11:01:09,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:09,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 1510 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:09,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:10,032 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 11:01:10,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:13,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:13,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:15,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:16,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:16,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:16,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:17,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:18,199 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 11:01:18,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915765864] [2020-07-20 11:01:18,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:18,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:01:18,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081355900] [2020-07-20 11:01:18,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:18,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:18,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:18,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:18,202 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 11:01:18,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:18,775 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 11:01:18,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:01:18,776 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 11:01:18,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:18,779 INFO L225 Difference]: With dead ends: 121 [2020-07-20 11:01:18,779 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 11:01:18,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:18,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 11:01:18,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 11:01:18,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 11:01:18,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 11:01:18,792 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 11:01:18,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:18,793 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 11:01:18,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:18,793 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 11:01:18,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 11:01:18,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:18,799 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:19,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:19,015 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:19,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:19,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 11:01:19,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:19,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339057928] [2020-07-20 11:01:19,016 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 11:01:19,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:19,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 1678 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:19,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 11:01:19,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:23,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:23,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:24,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:25,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:26,953 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 11:01:26,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339057928] [2020-07-20 11:01:26,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:26,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:01:26,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085296105] [2020-07-20 11:01:26,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:26,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:26,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:26,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:26,955 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 11:01:27,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:27,554 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 11:01:27,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:27,555 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 11:01:27,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:27,559 INFO L225 Difference]: With dead ends: 159 [2020-07-20 11:01:27,559 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 11:01:27,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:27,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 11:01:27,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 11:01:27,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 11:01:27,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 11:01:27,577 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 11:01:27,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:27,577 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 11:01:27,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:27,578 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 11:01:27,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 11:01:27,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:27,584 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:27,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:27,800 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:27,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:27,801 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 11:01:27,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:27,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018307815] [2020-07-20 11:01:27,802 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 11:01:28,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:28,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:01:28,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:28,634 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 11:01:28,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:31,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:32,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,561 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 11:01:34,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018307815] [2020-07-20 11:01:34,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:34,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:01:34,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292829487] [2020-07-20 11:01:34,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:01:34,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:34,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:01:34,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:01:34,564 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 11:01:35,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:35,038 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 11:01:35,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:35,039 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 11:01:35,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:35,044 INFO L225 Difference]: With dead ends: 179 [2020-07-20 11:01:35,044 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 11:01:35,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:01:35,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 11:01:35,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 11:01:35,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 11:01:35,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 11:01:35,068 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 11:01:35,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:35,068 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 11:01:35,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:01:35,069 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 11:01:35,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 11:01:35,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:35,081 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:35,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:35,296 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:35,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:35,297 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 11:01:35,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:35,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858066294] [2020-07-20 11:01:35,298 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 11:01:35,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:35,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 2400 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:35,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:36,569 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 11:01:36,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:40,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:42,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:42,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:43,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:43,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:44,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:44,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:44,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:44,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,775 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 11:01:45,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858066294] [2020-07-20 11:01:45,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:45,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:01:45,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286049094] [2020-07-20 11:01:45,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:45,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:45,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:45,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:45,778 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 11:01:46,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:46,364 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 11:01:46,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:46,367 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 11:01:46,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:46,371 INFO L225 Difference]: With dead ends: 156 [2020-07-20 11:01:46,371 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 11:01:46,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:46,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 11:01:46,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 11:01:46,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 11:01:46,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 11:01:46,389 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 11:01:46,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:46,390 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 11:01:46,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:46,390 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 11:01:46,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 11:01:46,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:46,400 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:46,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:46,613 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:46,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:46,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 11:01:46,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:46,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655557471] [2020-07-20 11:01:46,615 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 11:01:47,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:47,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 2178 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:01:47,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:47,962 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 11:01:47,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:51,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:51,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:52,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:52,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:53,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:53,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,280 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 11:01:55,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655557471] [2020-07-20 11:01:55,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:55,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:01:55,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978597435] [2020-07-20 11:01:55,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:01:55,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:55,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:01:55,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:01:55,283 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 11:01:55,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:55,810 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 11:01:55,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:55,811 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 11:01:55,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:55,816 INFO L225 Difference]: With dead ends: 174 [2020-07-20 11:01:55,816 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 11:01:55,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:01:55,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 11:01:55,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 11:01:55,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 11:01:55,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 11:01:55,838 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 11:01:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:55,839 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 11:01:55,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:01:55,839 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 11:01:55,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 11:01:55,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:55,852 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:56,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:56,066 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:56,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:56,067 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-20 11:01:56,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:56,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870918174] [2020-07-20 11:01:56,068 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 11:01:56,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:56,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 2522 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:56,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:57,476 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3598 refuted. 0 times theorem prover too weak. 33872 trivial. 0 not checked. [2020-07-20 11:01:57,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:02,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:04,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:06,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-20 11:02:08,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870918174] [2020-07-20 11:02:08,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:08,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:02:08,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193265876] [2020-07-20 11:02:08,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:08,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:08,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:08,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:08,987 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 11:02:09,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:09,865 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 11:02:09,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:09,866 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-20 11:02:09,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:09,871 INFO L225 Difference]: With dead ends: 263 [2020-07-20 11:02:09,871 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 11:02:09,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:09,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 11:02:09,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 11:02:09,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 11:02:09,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 11:02:09,903 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-20 11:02:09,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:09,903 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 11:02:09,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:09,904 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 11:02:09,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2020-07-20 11:02:09,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:09,916 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 63, 63, 58, 53, 42, 42, 42, 42, 42, 42, 42, 31, 31, 31, 31, 31, 31, 31, 31, 22, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:10,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:10,132 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:10,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:10,134 INFO L82 PathProgramCache]: Analyzing trace with hash 873446842, now seen corresponding path program 4 times [2020-07-20 11:02:10,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:10,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926823968] [2020-07-20 11:02:10,135 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 11:02:10,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:10,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 2224 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:02:10,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:11,405 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 639 proven. 3185 refuted. 0 times theorem prover too weak. 26267 trivial. 0 not checked. [2020-07-20 11:02:11,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:16,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:16,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:19,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:20,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:20,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:21,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:22,134 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 643 proven. 3233 refuted. 0 times theorem prover too weak. 26215 trivial. 0 not checked. [2020-07-20 11:02:22,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926823968] [2020-07-20 11:02:22,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:22,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:02:22,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999055430] [2020-07-20 11:02:22,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:22,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:22,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:22,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:22,137 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-20 11:02:23,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:23,071 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-20 11:02:23,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:23,072 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1000 [2020-07-20 11:02:23,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:23,080 INFO L225 Difference]: With dead ends: 385 [2020-07-20 11:02:23,080 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 11:02:23,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1955 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:23,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 11:02:23,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-20 11:02:23,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 11:02:23,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-20 11:02:23,115 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1000 [2020-07-20 11:02:23,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:23,116 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-20 11:02:23,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:23,116 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-20 11:02:23,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1218 [2020-07-20 11:02:23,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:23,140 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 86, 86, 72, 64, 46, 46, 46, 46, 46, 46, 46, 43, 43, 43, 43, 43, 43, 43, 29, 22, 21, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:23,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:23,354 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:23,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:23,355 INFO L82 PathProgramCache]: Analyzing trace with hash 21011846, now seen corresponding path program 5 times [2020-07-20 11:02:23,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:23,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715786807] [2020-07-20 11:02:23,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:24,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:24,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 2706 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:02:24,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:24,963 INFO L134 CoverageAnalysis]: Checked inductivity of 44056 backedges. 574 proven. 3606 refuted. 0 times theorem prover too weak. 39876 trivial. 0 not checked. [2020-07-20 11:02:24,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:30,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:33,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:34,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 44056 backedges. 576 proven. 3644 refuted. 0 times theorem prover too weak. 39836 trivial. 0 not checked. [2020-07-20 11:02:35,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715786807] [2020-07-20 11:02:35,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:35,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:02:35,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670379969] [2020-07-20 11:02:35,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:02:35,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:35,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:02:35,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:02:35,509 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-20 11:02:36,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:36,153 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-20 11:02:36,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:02:36,154 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1217 [2020-07-20 11:02:36,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:36,162 INFO L225 Difference]: With dead ends: 263 [2020-07-20 11:02:36,162 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 11:02:36,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2442 GetRequests, 2393 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:02:36,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 11:02:36,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-20 11:02:36,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 11:02:36,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 11:02:36,199 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1217 [2020-07-20 11:02:36,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:36,200 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 11:02:36,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:02:36,200 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 11:02:36,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-20 11:02:36,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:36,218 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 75, 75, 63, 58, 42, 42, 42, 42, 42, 42, 42, 37, 37, 37, 37, 37, 37, 37, 26, 21, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:36,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:36,432 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:36,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:36,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1339920950, now seen corresponding path program 6 times [2020-07-20 11:02:36,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:36,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958714197] [2020-07-20 11:02:36,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:37,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:37,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 2406 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:02:37,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:37,770 INFO L134 CoverageAnalysis]: Checked inductivity of 34758 backedges. 556 proven. 2724 refuted. 0 times theorem prover too weak. 31478 trivial. 0 not checked. [2020-07-20 11:02:37,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:41,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:44,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,327 INFO L134 CoverageAnalysis]: Checked inductivity of 34758 backedges. 556 proven. 2754 refuted. 0 times theorem prover too weak. 31448 trivial. 0 not checked. [2020-07-20 11:02:46,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958714197] [2020-07-20 11:02:46,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:46,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:02:46,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256820773] [2020-07-20 11:02:46,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:02:46,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:46,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:02:46,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:02:46,331 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 11:02:46,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:46,850 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-20 11:02:46,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:02:46,851 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1082 [2020-07-20 11:02:46,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:46,858 INFO L225 Difference]: With dead ends: 299 [2020-07-20 11:02:46,859 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 11:02:46,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2171 GetRequests, 2127 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:02:46,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 11:02:46,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-20 11:02:46,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 11:02:46,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 11:02:46,901 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1082 [2020-07-20 11:02:46,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:46,902 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 11:02:46,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:02:46,902 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 11:02:46,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 911 [2020-07-20 11:02:46,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:46,914 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 66, 66, 53, 52, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 20, 19, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:47,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:47,127 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:47,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:47,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1568708421, now seen corresponding path program 7 times [2020-07-20 11:02:47,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:47,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459190413] [2020-07-20 11:02:47,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:47,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:47,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 2023 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:02:47,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:48,340 INFO L134 CoverageAnalysis]: Checked inductivity of 24352 backedges. 777 proven. 2659 refuted. 0 times theorem prover too weak. 20916 trivial. 0 not checked. [2020-07-20 11:02:48,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:53,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:53,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:55,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:55,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:56,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:57,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:57,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,687 INFO L134 CoverageAnalysis]: Checked inductivity of 24352 backedges. 781 proven. 2707 refuted. 0 times theorem prover too weak. 20864 trivial. 0 not checked. [2020-07-20 11:02:59,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459190413] [2020-07-20 11:02:59,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:59,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:02:59,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902070150] [2020-07-20 11:02:59,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:59,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:59,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:59,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:59,689 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 25 states. [2020-07-20 11:03:00,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:00,552 INFO L93 Difference]: Finished difference Result 238 states and 729 transitions. [2020-07-20 11:03:00,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:03:00,555 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 910 [2020-07-20 11:03:00,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:00,560 INFO L225 Difference]: With dead ends: 238 [2020-07-20 11:03:00,561 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 11:03:00,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1829 GetRequests, 1775 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:03:00,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 11:03:00,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 158. [2020-07-20 11:03:00,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 11:03:00,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 384 transitions. [2020-07-20 11:03:00,609 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 384 transitions. Word has length 910 [2020-07-20 11:03:00,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:00,610 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 384 transitions. [2020-07-20 11:03:00,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:03:00,610 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 384 transitions. [2020-07-20 11:03:00,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1166 [2020-07-20 11:03:00,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:00,636 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 84, 84, 67, 65, 43, 43, 43, 43, 43, 43, 43, 42, 42, 42, 42, 42, 42, 42, 25, 22, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:00,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:00,851 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:00,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:00,852 INFO L82 PathProgramCache]: Analyzing trace with hash -288057632, now seen corresponding path program 8 times [2020-07-20 11:03:00,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:00,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029708295] [2020-07-20 11:03:00,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:01,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 2590 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:03:01,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:02,350 INFO L134 CoverageAnalysis]: Checked inductivity of 40255 backedges. 676 proven. 2915 refuted. 0 times theorem prover too weak. 36664 trivial. 0 not checked. [2020-07-20 11:03:02,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:07,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:08,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:09,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:09,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:11,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:11,721 INFO L134 CoverageAnalysis]: Checked inductivity of 40255 backedges. 678 proven. 2946 refuted. 0 times theorem prover too weak. 36631 trivial. 0 not checked. [2020-07-20 11:03:11,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029708295] [2020-07-20 11:03:11,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:11,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:03:11,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408322003] [2020-07-20 11:03:11,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:03:11,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:11,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:03:11,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:03:11,724 INFO L87 Difference]: Start difference. First operand 158 states and 384 transitions. Second operand 21 states. [2020-07-20 11:03:12,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:12,302 INFO L93 Difference]: Finished difference Result 259 states and 851 transitions. [2020-07-20 11:03:12,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:03:12,303 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1165 [2020-07-20 11:03:12,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:12,308 INFO L225 Difference]: With dead ends: 259 [2020-07-20 11:03:12,308 INFO L226 Difference]: Without dead ends: 245 [2020-07-20 11:03:12,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2337 GetRequests, 2293 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:03:12,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2020-07-20 11:03:12,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 178. [2020-07-20 11:03:12,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2020-07-20 11:03:12,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 483 transitions. [2020-07-20 11:03:12,341 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 483 transitions. Word has length 1165 [2020-07-20 11:03:12,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:12,342 INFO L479 AbstractCegarLoop]: Abstraction has 178 states and 483 transitions. [2020-07-20 11:03:12,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:03:12,342 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 483 transitions. [2020-07-20 11:03:12,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1269 [2020-07-20 11:03:12,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:12,360 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 94, 94, 67, 60, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 35, 27, 20, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:12,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:12,576 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:12,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:12,577 INFO L82 PathProgramCache]: Analyzing trace with hash 899550225, now seen corresponding path program 9 times [2020-07-20 11:03:12,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:12,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105569532] [2020-07-20 11:03:12,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:13,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 2823 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:03:13,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:14,318 INFO L134 CoverageAnalysis]: Checked inductivity of 47973 backedges. 719 proven. 3631 refuted. 0 times theorem prover too weak. 43623 trivial. 0 not checked. [2020-07-20 11:03:14,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:20,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:22,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:22,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:24,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:24,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:26,558 INFO L134 CoverageAnalysis]: Checked inductivity of 47973 backedges. 721 proven. 3669 refuted. 0 times theorem prover too weak. 43583 trivial. 0 not checked. [2020-07-20 11:03:26,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105569532] [2020-07-20 11:03:26,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:26,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:03:26,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180386738] [2020-07-20 11:03:26,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:03:26,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:26,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:03:26,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:03:26,561 INFO L87 Difference]: Start difference. First operand 178 states and 483 transitions. Second operand 23 states. [2020-07-20 11:03:27,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:27,131 INFO L93 Difference]: Finished difference Result 267 states and 914 transitions. [2020-07-20 11:03:27,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:03:27,137 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1268 [2020-07-20 11:03:27,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:27,143 INFO L225 Difference]: With dead ends: 267 [2020-07-20 11:03:27,143 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 11:03:27,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2544 GetRequests, 2495 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:03:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 11:03:27,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 179. [2020-07-20 11:03:27,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 11:03:27,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 489 transitions. [2020-07-20 11:03:27,179 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 489 transitions. Word has length 1268 [2020-07-20 11:03:27,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:27,180 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 489 transitions. [2020-07-20 11:03:27,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:03:27,180 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 489 transitions. [2020-07-20 11:03:27,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 915 [2020-07-20 11:03:27,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:27,192 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 63, 63, 57, 52, 35, 35, 35, 35, 35, 35, 35, 31, 31, 31, 31, 31, 31, 31, 22, 21, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:27,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:27,406 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:27,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:27,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1009870659, now seen corresponding path program 10 times [2020-07-20 11:03:27,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:27,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518330778] [2020-07-20 11:03:27,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:28,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:28,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 2031 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:03:28,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 24634 backedges. 573 proven. 2167 refuted. 0 times theorem prover too weak. 21894 trivial. 0 not checked. [2020-07-20 11:03:28,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:33,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:34,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:35,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:35,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:36,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:37,483 INFO L134 CoverageAnalysis]: Checked inductivity of 24634 backedges. 573 proven. 2199 refuted. 0 times theorem prover too weak. 21862 trivial. 0 not checked. [2020-07-20 11:03:37,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518330778] [2020-07-20 11:03:37,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:37,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:03:37,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794322122] [2020-07-20 11:03:37,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:03:37,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:37,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:03:37,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:03:37,485 INFO L87 Difference]: Start difference. First operand 179 states and 489 transitions. Second operand 21 states. [2020-07-20 11:03:37,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:37,988 INFO L93 Difference]: Finished difference Result 295 states and 1090 transitions. [2020-07-20 11:03:37,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:03:37,989 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 914 [2020-07-20 11:03:37,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:37,997 INFO L225 Difference]: With dead ends: 295 [2020-07-20 11:03:37,997 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 11:03:38,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1835 GetRequests, 1791 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:03:38,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 11:03:38,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 173. [2020-07-20 11:03:38,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 11:03:38,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 11:03:38,034 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 914 [2020-07-20 11:03:38,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:38,035 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 11:03:38,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:03:38,035 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 11:03:38,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1303 [2020-07-20 11:03:38,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:38,054 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 93, 93, 75, 74, 49, 49, 49, 49, 49, 49, 49, 46, 46, 46, 46, 46, 46, 46, 28, 26, 24, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:38,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:38,269 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:38,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:38,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1820119562, now seen corresponding path program 11 times [2020-07-20 11:03:38,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:38,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647573201] [2020-07-20 11:03:38,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:39,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:39,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 2894 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:03:39,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:40,035 INFO L134 CoverageAnalysis]: Checked inductivity of 50444 backedges. 653 proven. 2871 refuted. 0 times theorem prover too weak. 46920 trivial. 0 not checked. [2020-07-20 11:03:40,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:46,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:46,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:47,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:48,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:48,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:49,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 50444 backedges. 653 proven. 2895 refuted. 0 times theorem prover too weak. 46896 trivial. 0 not checked. [2020-07-20 11:03:50,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647573201] [2020-07-20 11:03:50,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:50,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:03:50,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787445669] [2020-07-20 11:03:50,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:03:50,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:50,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:03:50,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:03:50,554 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-20 11:03:51,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:51,062 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-20 11:03:51,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:03:51,063 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1302 [2020-07-20 11:03:51,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:51,071 INFO L225 Difference]: With dead ends: 348 [2020-07-20 11:03:51,071 INFO L226 Difference]: Without dead ends: 334 [2020-07-20 11:03:51,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2610 GetRequests, 2571 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:03:51,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-20 11:03:51,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-20 11:03:51,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 11:03:51,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 11:03:51,119 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 1302 [2020-07-20 11:03:51,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:51,119 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 11:03:51,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:03:51,120 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 11:03:51,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1143 [2020-07-20 11:03:51,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:51,135 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 81, 81, 71, 62, 43, 43, 43, 43, 43, 43, 43, 40, 40, 40, 40, 40, 40, 40, 28, 24, 22, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:51,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:51,349 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:51,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:51,349 INFO L82 PathProgramCache]: Analyzing trace with hash 690746356, now seen corresponding path program 12 times [2020-07-20 11:03:51,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:51,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [377936264] [2020-07-20 11:03:51,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:52,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:52,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 2538 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:03:52,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:53,074 INFO L134 CoverageAnalysis]: Checked inductivity of 38688 backedges. 706 proven. 2766 refuted. 0 times theorem prover too weak. 35216 trivial. 0 not checked. [2020-07-20 11:03:53,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:58,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:58,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:00,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:00,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:01,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:01,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:03,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:03,823 INFO L134 CoverageAnalysis]: Checked inductivity of 38688 backedges. 708 proven. 2794 refuted. 0 times theorem prover too weak. 35186 trivial. 0 not checked. [2020-07-20 11:04:03,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [377936264] [2020-07-20 11:04:03,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:03,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:04:03,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997940679] [2020-07-20 11:04:03,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:04:03,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:03,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:04:03,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:04:03,826 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 21 states. [2020-07-20 11:04:04,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:04,369 INFO L93 Difference]: Finished difference Result 261 states and 855 transitions. [2020-07-20 11:04:04,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:04:04,370 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1142 [2020-07-20 11:04:04,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:04,376 INFO L225 Difference]: With dead ends: 261 [2020-07-20 11:04:04,376 INFO L226 Difference]: Without dead ends: 247 [2020-07-20 11:04:04,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2291 GetRequests, 2247 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:04:04,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2020-07-20 11:04:04,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 173. [2020-07-20 11:04:04,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 11:04:04,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 11:04:04,407 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1142 [2020-07-20 11:04:04,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:04,407 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 11:04:04,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:04:04,408 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 11:04:04,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 960 [2020-07-20 11:04:04,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:04,421 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 70, 70, 53, 53, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:04,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:04,637 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:04,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:04,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1581976479, now seen corresponding path program 13 times [2020-07-20 11:04:04,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:04,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673323714] [2020-07-20 11:04:04,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:05,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:05,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 2133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:04:05,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:06,132 INFO L134 CoverageAnalysis]: Checked inductivity of 27116 backedges. 738 proven. 2544 refuted. 0 times theorem prover too weak. 23834 trivial. 0 not checked. [2020-07-20 11:04:06,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:11,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:13,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:13,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:14,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:15,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:15,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:16,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:17,374 INFO L134 CoverageAnalysis]: Checked inductivity of 27116 backedges. 746 proven. 2576 refuted. 0 times theorem prover too weak. 23794 trivial. 0 not checked. [2020-07-20 11:04:17,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673323714] [2020-07-20 11:04:17,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:17,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:04:17,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201051685] [2020-07-20 11:04:17,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:04:17,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:17,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:04:17,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:04:17,377 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 23 states. [2020-07-20 11:04:18,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:18,111 INFO L93 Difference]: Finished difference Result 296 states and 1021 transitions. [2020-07-20 11:04:18,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:04:18,121 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 959 [2020-07-20 11:04:18,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:18,126 INFO L225 Difference]: With dead ends: 296 [2020-07-20 11:04:18,126 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 11:04:18,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1926 GetRequests, 1877 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:04:18,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 11:04:18,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 187. [2020-07-20 11:04:18,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 11:04:18,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 513 transitions. [2020-07-20 11:04:18,158 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 513 transitions. Word has length 959 [2020-07-20 11:04:18,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:18,158 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 513 transitions. [2020-07-20 11:04:18,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:04:18,158 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 513 transitions. [2020-07-20 11:04:18,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1022 [2020-07-20 11:04:18,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:18,173 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 60, 60, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 23, 23, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:18,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:18,386 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:18,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:18,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1947595999, now seen corresponding path program 14 times [2020-07-20 11:04:18,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:18,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055354098] [2020-07-20 11:04:18,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:19,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 2269 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:04:19,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:19,867 INFO L134 CoverageAnalysis]: Checked inductivity of 30772 backedges. 731 proven. 2396 refuted. 0 times theorem prover too weak. 27645 trivial. 0 not checked. [2020-07-20 11:04:19,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:25,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:25,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:27,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:28,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:28,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:28,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:28,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:29,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:29,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:29,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:29,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:30,195 INFO L134 CoverageAnalysis]: Checked inductivity of 30772 backedges. 733 proven. 2427 refuted. 0 times theorem prover too weak. 27612 trivial. 0 not checked. [2020-07-20 11:04:30,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055354098] [2020-07-20 11:04:30,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:30,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:04:30,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826420721] [2020-07-20 11:04:30,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:04:30,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:30,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:04:30,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:04:30,198 INFO L87 Difference]: Start difference. First operand 187 states and 513 transitions. Second operand 21 states. [2020-07-20 11:04:30,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:30,793 INFO L93 Difference]: Finished difference Result 297 states and 1088 transitions. [2020-07-20 11:04:30,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:04:30,795 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1021 [2020-07-20 11:04:30,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:30,802 INFO L225 Difference]: With dead ends: 297 [2020-07-20 11:04:30,802 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 11:04:30,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2049 GetRequests, 2005 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:04:30,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 11:04:30,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 216. [2020-07-20 11:04:30,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 11:04:30,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 668 transitions. [2020-07-20 11:04:30,840 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 668 transitions. Word has length 1021 [2020-07-20 11:04:30,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:30,840 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 668 transitions. [2020-07-20 11:04:30,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:04:30,841 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 668 transitions. [2020-07-20 11:04:30,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1222 [2020-07-20 11:04:30,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:30,858 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 90, 90, 67, 61, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 30, 23, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:31,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:31,074 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:31,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:31,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1897857947, now seen corresponding path program 15 times [2020-07-20 11:04:31,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:31,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213202128] [2020-07-20 11:04:31,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:32,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:32,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 2717 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:04:32,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:32,874 INFO L134 CoverageAnalysis]: Checked inductivity of 44361 backedges. 887 proven. 3295 refuted. 0 times theorem prover too weak. 40179 trivial. 0 not checked. [2020-07-20 11:04:32,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:40,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:43,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:44,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:45,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:45,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:45,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:46,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:47,514 INFO L134 CoverageAnalysis]: Checked inductivity of 44361 backedges. 891 proven. 3331 refuted. 0 times theorem prover too weak. 40139 trivial. 0 not checked. [2020-07-20 11:04:47,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213202128] [2020-07-20 11:04:47,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:47,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:04:47,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615182899] [2020-07-20 11:04:47,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:04:47,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:47,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:04:47,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:04:47,517 INFO L87 Difference]: Start difference. First operand 216 states and 668 transitions. Second operand 23 states. [2020-07-20 11:04:48,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:48,274 INFO L93 Difference]: Finished difference Result 293 states and 1058 transitions. [2020-07-20 11:04:48,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:04:48,276 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1221 [2020-07-20 11:04:48,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:48,283 INFO L225 Difference]: With dead ends: 293 [2020-07-20 11:04:48,283 INFO L226 Difference]: Without dead ends: 276 [2020-07-20 11:04:48,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2450 GetRequests, 2401 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:04:48,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2020-07-20 11:04:48,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 209. [2020-07-20 11:04:48,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 11:04:48,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 628 transitions. [2020-07-20 11:04:48,316 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 628 transitions. Word has length 1221 [2020-07-20 11:04:48,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:48,317 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 628 transitions. [2020-07-20 11:04:48,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:04:48,317 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 628 transitions. [2020-07-20 11:04:48,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1088 [2020-07-20 11:04:48,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:48,333 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 78, 78, 63, 63, 40, 40, 40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 39, 24, 23, 18, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:48,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:48,548 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:48,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:48,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1691733338, now seen corresponding path program 16 times [2020-07-20 11:04:48,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:48,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934604525] [2020-07-20 11:04:48,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:49,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:49,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 2416 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:04:49,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:50,310 INFO L134 CoverageAnalysis]: Checked inductivity of 34962 backedges. 1012 proven. 3151 refuted. 0 times theorem prover too weak. 30799 trivial. 0 not checked. [2020-07-20 11:04:50,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:58,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:00,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:00,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:01,831 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 11:05:02,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:03,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:04,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:04,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:05,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:05,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:05,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:05,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:05,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:06,614 INFO L134 CoverageAnalysis]: Checked inductivity of 34962 backedges. 1014 proven. 3201 refuted. 0 times theorem prover too weak. 30747 trivial. 0 not checked. [2020-07-20 11:05:06,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934604525] [2020-07-20 11:05:06,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:06,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:05:06,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672179808] [2020-07-20 11:05:06,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:05:06,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:06,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:05:06,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:05:06,618 INFO L87 Difference]: Start difference. First operand 209 states and 628 transitions. Second operand 25 states. [2020-07-20 11:05:07,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:07,776 INFO L93 Difference]: Finished difference Result 303 states and 1021 transitions. [2020-07-20 11:05:07,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:05:07,779 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1087 [2020-07-20 11:05:07,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:07,784 INFO L225 Difference]: With dead ends: 303 [2020-07-20 11:05:07,784 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 11:05:07,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2183 GetRequests, 2129 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:05:07,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 11:05:07,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 248. [2020-07-20 11:05:07,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 11:05:07,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-20 11:05:07,820 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1087 [2020-07-20 11:05:07,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:07,820 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-20 11:05:07,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:05:07,821 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-20 11:05:07,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1227 [2020-07-20 11:05:07,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:07,841 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 86, 86, 75, 70, 46, 46, 46, 46, 46, 46, 46, 43, 43, 43, 43, 43, 43, 43, 32, 24, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:08,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:08,055 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:08,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:08,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1177037048, now seen corresponding path program 17 times [2020-07-20 11:05:08,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:08,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450014017] [2020-07-20 11:05:08,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:09,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:09,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 2724 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:05:09,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:09,977 INFO L134 CoverageAnalysis]: Checked inductivity of 44674 backedges. 797 proven. 2931 refuted. 0 times theorem prover too weak. 40946 trivial. 0 not checked. [2020-07-20 11:05:09,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:18,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:20,210 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:05:20,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:20,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:21,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:23,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,318 INFO L134 CoverageAnalysis]: Checked inductivity of 44674 backedges. 799 proven. 2959 refuted. 0 times theorem prover too weak. 40916 trivial. 0 not checked. [2020-07-20 11:05:24,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450014017] [2020-07-20 11:05:24,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:24,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:05:24,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814996326] [2020-07-20 11:05:24,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:05:24,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:24,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:05:24,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:05:24,321 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-20 11:05:24,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:24,998 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-20 11:05:25,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:05:25,001 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1226 [2020-07-20 11:05:25,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:25,010 INFO L225 Difference]: With dead ends: 400 [2020-07-20 11:05:25,010 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 11:05:25,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2459 GetRequests, 2415 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:05:25,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 11:05:25,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-20 11:05:25,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 11:05:25,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-20 11:05:25,059 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1226 [2020-07-20 11:05:25,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:25,060 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-20 11:05:25,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:05:25,060 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-20 11:05:25,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 997 [2020-07-20 11:05:25,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:25,071 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 70, 70, 60, 59, 37, 37, 37, 37, 37, 37, 37, 35, 35, 35, 35, 35, 35, 35, 25, 22, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:25,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:25,287 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:25,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:25,288 INFO L82 PathProgramCache]: Analyzing trace with hash 2000533305, now seen corresponding path program 18 times [2020-07-20 11:05:25,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:25,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771487554] [2020-07-20 11:05:25,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:26,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:26,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 2213 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:05:26,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:26,988 INFO L134 CoverageAnalysis]: Checked inductivity of 29285 backedges. 763 proven. 1910 refuted. 0 times theorem prover too weak. 26612 trivial. 0 not checked. [2020-07-20 11:05:26,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:32,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:32,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:33,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:33,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:35,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:35,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:36,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:36,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:36,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:36,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:36,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:37,955 INFO L134 CoverageAnalysis]: Checked inductivity of 29285 backedges. 763 proven. 1936 refuted. 0 times theorem prover too weak. 26586 trivial. 0 not checked. [2020-07-20 11:05:37,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771487554] [2020-07-20 11:05:37,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:37,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:05:37,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692560445] [2020-07-20 11:05:37,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:05:37,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:37,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:05:37,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:05:37,958 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-20 11:05:38,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:38,602 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-20 11:05:38,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:05:38,603 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 996 [2020-07-20 11:05:38,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:38,615 INFO L225 Difference]: With dead ends: 489 [2020-07-20 11:05:38,616 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 11:05:38,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1998 GetRequests, 1959 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:05:38,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 11:05:38,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-20 11:05:38,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 11:05:38,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 11:05:38,686 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 996 [2020-07-20 11:05:38,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:38,687 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 11:05:38,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:05:38,687 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 11:05:38,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1651 [2020-07-20 11:05:38,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:38,716 INFO L422 BasicCegarLoop]: trace histogram [122, 122, 121, 121, 94, 91, 61, 61, 61, 61, 61, 61, 61, 60, 60, 60, 60, 60, 60, 60, 34, 30, 30, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:38,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:38,931 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:38,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:38,932 INFO L82 PathProgramCache]: Analyzing trace with hash -534250060, now seen corresponding path program 19 times [2020-07-20 11:05:38,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:38,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739803204] [2020-07-20 11:05:38,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:40,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:40,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 3668 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:05:40,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:41,290 INFO L134 CoverageAnalysis]: Checked inductivity of 81430 backedges. 941 proven. 4145 refuted. 0 times theorem prover too weak. 76344 trivial. 0 not checked. [2020-07-20 11:05:41,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:52,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:57,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:59,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:00,762 INFO L134 CoverageAnalysis]: Checked inductivity of 81430 backedges. 941 proven. 4177 refuted. 0 times theorem prover too weak. 76312 trivial. 0 not checked. [2020-07-20 11:06:00,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739803204] [2020-07-20 11:06:00,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:00,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:06:00,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005173067] [2020-07-20 11:06:00,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:06:00,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:00,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:06:00,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:06:00,765 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-20 11:06:01,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:01,487 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-20 11:06:01,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:06:01,489 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1650 [2020-07-20 11:06:01,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:01,496 INFO L225 Difference]: With dead ends: 357 [2020-07-20 11:06:01,496 INFO L226 Difference]: Without dead ends: 340 [2020-07-20 11:06:01,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3307 GetRequests, 3263 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:06:01,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-20 11:06:01,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2020-07-20 11:06:01,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 11:06:01,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 608 transitions. [2020-07-20 11:06:01,526 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 608 transitions. Word has length 1650 [2020-07-20 11:06:01,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:01,527 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 608 transitions. [2020-07-20 11:06:01,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:06:01,528 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 608 transitions. [2020-07-20 11:06:01,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1171 [2020-07-20 11:06:01,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:01,539 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 82, 82, 70, 67, 44, 44, 44, 44, 44, 44, 44, 41, 41, 41, 41, 41, 41, 41, 26, 26, 22, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:01,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:01,740 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:01,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:01,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1480105960, now seen corresponding path program 20 times [2020-07-20 11:06:01,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:01,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918955452] [2020-07-20 11:06:01,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:02,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:02,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 2600 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:06:02,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 40638 backedges. 950 proven. 3122 refuted. 0 times theorem prover too weak. 36566 trivial. 0 not checked. [2020-07-20 11:06:03,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:13,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:16,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:16,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:18,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:18,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:18,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:18,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:19,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:20,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:20,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:21,518 INFO L134 CoverageAnalysis]: Checked inductivity of 40638 backedges. 954 proven. 3160 refuted. 0 times theorem prover too weak. 36524 trivial. 0 not checked. [2020-07-20 11:06:21,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918955452] [2020-07-20 11:06:21,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:21,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:06:21,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647720347] [2020-07-20 11:06:21,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:06:21,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:21,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:06:21,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:06:21,521 INFO L87 Difference]: Start difference. First operand 226 states and 608 transitions. Second operand 23 states. [2020-07-20 11:06:22,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:22,674 INFO L93 Difference]: Finished difference Result 366 states and 1284 transitions. [2020-07-20 11:06:22,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:06:22,677 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1170 [2020-07-20 11:06:22,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:22,685 INFO L225 Difference]: With dead ends: 366 [2020-07-20 11:06:22,685 INFO L226 Difference]: Without dead ends: 323 [2020-07-20 11:06:22,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2348 GetRequests, 2299 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:06:22,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-20 11:06:22,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 222. [2020-07-20 11:06:22,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 11:06:22,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 594 transitions. [2020-07-20 11:06:22,727 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 594 transitions. Word has length 1170 [2020-07-20 11:06:22,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:22,727 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 594 transitions. [2020-07-20 11:06:22,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:06:22,727 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 594 transitions. [2020-07-20 11:06:22,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1071 [2020-07-20 11:06:22,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:22,744 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 77, 77, 62, 59, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 24, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:22,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:22,957 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:22,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:22,958 INFO L82 PathProgramCache]: Analyzing trace with hash 810660743, now seen corresponding path program 21 times [2020-07-20 11:06:22,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:22,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84255944] [2020-07-20 11:06:22,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:24,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:24,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:06:24,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:24,875 INFO L134 CoverageAnalysis]: Checked inductivity of 33878 backedges. 756 proven. 2110 refuted. 0 times theorem prover too weak. 31012 trivial. 0 not checked. [2020-07-20 11:06:24,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:31,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:31,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:34,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:34,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:35,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:35,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:36,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:37,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:38,425 INFO L134 CoverageAnalysis]: Checked inductivity of 33878 backedges. 758 proven. 2132 refuted. 0 times theorem prover too weak. 30988 trivial. 0 not checked. [2020-07-20 11:06:38,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84255944] [2020-07-20 11:06:38,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:38,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:06:38,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128933612] [2020-07-20 11:06:38,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:06:38,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:38,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:06:38,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:06:38,429 INFO L87 Difference]: Start difference. First operand 222 states and 594 transitions. Second operand 19 states. [2020-07-20 11:06:39,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:39,147 INFO L93 Difference]: Finished difference Result 388 states and 1495 transitions. [2020-07-20 11:06:39,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:06:39,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1070 [2020-07-20 11:06:39,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:39,159 INFO L225 Difference]: With dead ends: 388 [2020-07-20 11:06:39,159 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 11:06:39,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2146 GetRequests, 2107 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:06:39,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 11:06:39,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 235. [2020-07-20 11:06:39,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 11:06:39,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 653 transitions. [2020-07-20 11:06:39,195 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 653 transitions. Word has length 1070 [2020-07-20 11:06:39,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:39,195 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 653 transitions. [2020-07-20 11:06:39,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:06:39,195 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 653 transitions. [2020-07-20 11:06:39,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1257 [2020-07-20 11:06:39,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:39,213 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 83, 83, 70, 69, 51, 51, 51, 51, 51, 51, 51, 41, 41, 41, 41, 41, 41, 41, 32, 29, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:39,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:39,414 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:39,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:39,415 INFO L82 PathProgramCache]: Analyzing trace with hash 118044811, now seen corresponding path program 22 times [2020-07-20 11:06:39,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:39,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454037789] [2020-07-20 11:06:39,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:40,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:40,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 2793 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:06:40,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:41,529 INFO L134 CoverageAnalysis]: Checked inductivity of 47357 backedges. 937 proven. 2907 refuted. 0 times theorem prover too weak. 43513 trivial. 0 not checked. [2020-07-20 11:06:41,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:50,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:50,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:54,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:56,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:56,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:57,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:58,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:00,396 INFO L134 CoverageAnalysis]: Checked inductivity of 47357 backedges. 941 proven. 2933 refuted. 0 times theorem prover too weak. 43483 trivial. 0 not checked. [2020-07-20 11:07:00,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454037789] [2020-07-20 11:07:00,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:00,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:07:00,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263262995] [2020-07-20 11:07:00,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:07:00,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:00,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:07:00,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:07:00,401 INFO L87 Difference]: Start difference. First operand 235 states and 653 transitions. Second operand 21 states. [2020-07-20 11:07:01,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:01,239 INFO L93 Difference]: Finished difference Result 321 states and 1004 transitions. [2020-07-20 11:07:01,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:07:01,242 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1256 [2020-07-20 11:07:01,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:01,249 INFO L225 Difference]: With dead ends: 321 [2020-07-20 11:07:01,249 INFO L226 Difference]: Without dead ends: 301 [2020-07-20 11:07:01,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2519 GetRequests, 2475 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:07:01,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-20 11:07:01,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 222. [2020-07-20 11:07:01,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 11:07:01,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 571 transitions. [2020-07-20 11:07:01,285 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 571 transitions. Word has length 1256 [2020-07-20 11:07:01,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:01,286 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 571 transitions. [2020-07-20 11:07:01,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:07:01,286 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 571 transitions. [2020-07-20 11:07:01,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1277 [2020-07-20 11:07:01,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:01,303 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 93, 93, 74, 73, 47, 47, 47, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 28, 26, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:01,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:01,505 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:01,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:01,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1965319518, now seen corresponding path program 23 times [2020-07-20 11:07:01,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:01,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077995524] [2020-07-20 11:07:01,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:02,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:02,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 2836 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:07:02,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:03,717 INFO L134 CoverageAnalysis]: Checked inductivity of 48389 backedges. 1046 proven. 2913 refuted. 0 times theorem prover too weak. 44430 trivial. 0 not checked. [2020-07-20 11:07:03,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:14,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:17,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:19,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:20,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:22,389 INFO L134 CoverageAnalysis]: Checked inductivity of 48389 backedges. 1050 proven. 2942 refuted. 0 times theorem prover too weak. 44397 trivial. 0 not checked. [2020-07-20 11:07:22,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077995524] [2020-07-20 11:07:22,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:22,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:07:22,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326694374] [2020-07-20 11:07:22,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:07:22,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:22,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:07:22,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:07:22,393 INFO L87 Difference]: Start difference. First operand 222 states and 571 transitions. Second operand 21 states. [2020-07-20 11:07:23,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:23,270 INFO L93 Difference]: Finished difference Result 339 states and 1150 transitions. [2020-07-20 11:07:23,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:07:23,273 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1276 [2020-07-20 11:07:23,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:23,281 INFO L225 Difference]: With dead ends: 339 [2020-07-20 11:07:23,281 INFO L226 Difference]: Without dead ends: 330 [2020-07-20 11:07:23,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2559 GetRequests, 2515 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:07:23,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2020-07-20 11:07:23,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 266. [2020-07-20 11:07:23,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-20 11:07:23,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 794 transitions. [2020-07-20 11:07:23,324 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 794 transitions. Word has length 1276 [2020-07-20 11:07:23,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:23,324 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 794 transitions. [2020-07-20 11:07:23,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:07:23,325 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 794 transitions. [2020-07-20 11:07:23,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1306 [2020-07-20 11:07:23,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:23,341 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 88, 88, 72, 68, 52, 52, 52, 52, 52, 52, 52, 44, 44, 44, 44, 44, 44, 44, 37, 24, 20, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:23,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:23,542 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:23,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:23,543 INFO L82 PathProgramCache]: Analyzing trace with hash -828943617, now seen corresponding path program 24 times [2020-07-20 11:07:23,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:23,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632126139] [2020-07-20 11:07:23,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:24,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:24,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 2903 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:07:24,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:25,793 INFO L134 CoverageAnalysis]: Checked inductivity of 51074 backedges. 1258 proven. 3317 refuted. 0 times theorem prover too weak. 46499 trivial. 0 not checked. [2020-07-20 11:07:25,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:36,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:41,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:45,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:46,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:47,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:48,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:48,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:48,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:48,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:49,995 INFO L134 CoverageAnalysis]: Checked inductivity of 51074 backedges. 1264 proven. 3351 refuted. 0 times theorem prover too weak. 46459 trivial. 0 not checked. [2020-07-20 11:07:49,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632126139] [2020-07-20 11:07:49,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:49,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:07:49,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773669079] [2020-07-20 11:07:49,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:07:49,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:49,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:07:49,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:07:49,998 INFO L87 Difference]: Start difference. First operand 266 states and 794 transitions. Second operand 23 states. [2020-07-20 11:07:51,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:51,012 INFO L93 Difference]: Finished difference Result 372 states and 1248 transitions. [2020-07-20 11:07:51,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:07:51,014 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1305 [2020-07-20 11:07:51,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:51,020 INFO L225 Difference]: With dead ends: 372 [2020-07-20 11:07:51,020 INFO L226 Difference]: Without dead ends: 323 [2020-07-20 11:07:51,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2618 GetRequests, 2569 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:07:51,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-20 11:07:51,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 284. [2020-07-20 11:07:51,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 11:07:51,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 927 transitions. [2020-07-20 11:07:51,061 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 927 transitions. Word has length 1305 [2020-07-20 11:07:51,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:51,062 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 927 transitions. [2020-07-20 11:07:51,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:07:51,062 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 927 transitions. [2020-07-20 11:07:51,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 933 [2020-07-20 11:07:51,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:51,076 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 66, 66, 53, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 21, 18, 17, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:51,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:51,291 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:51,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:51,292 INFO L82 PathProgramCache]: Analyzing trace with hash 296814709, now seen corresponding path program 25 times [2020-07-20 11:07:51,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:51,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460895720] [2020-07-20 11:07:51,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:52,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:52,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 2073 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:07:52,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:53,238 INFO L134 CoverageAnalysis]: Checked inductivity of 25615 backedges. 752 proven. 1688 refuted. 0 times theorem prover too weak. 23175 trivial. 0 not checked. [2020-07-20 11:07:53,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:01,973 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:08:02,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:05,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:07,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:08,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:09,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:09,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:09,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:11,391 INFO L134 CoverageAnalysis]: Checked inductivity of 25615 backedges. 752 proven. 1711 refuted. 0 times theorem prover too weak. 23152 trivial. 0 not checked. [2020-07-20 11:08:11,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460895720] [2020-07-20 11:08:11,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:11,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:08:11,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192228372] [2020-07-20 11:08:11,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:08:11,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:11,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:08:11,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:08:11,394 INFO L87 Difference]: Start difference. First operand 284 states and 927 transitions. Second operand 19 states. [2020-07-20 11:08:12,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:12,538 INFO L93 Difference]: Finished difference Result 465 states and 2008 transitions. [2020-07-20 11:08:12,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:08:12,543 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 932 [2020-07-20 11:08:12,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:12,556 INFO L225 Difference]: With dead ends: 465 [2020-07-20 11:08:12,556 INFO L226 Difference]: Without dead ends: 447 [2020-07-20 11:08:12,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1870 GetRequests, 1831 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:08:12,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-20 11:08:12,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 275. [2020-07-20 11:08:12,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-20 11:08:12,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 870 transitions. [2020-07-20 11:08:12,607 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 870 transitions. Word has length 932 [2020-07-20 11:08:12,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:12,607 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 870 transitions. [2020-07-20 11:08:12,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:08:12,607 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 870 transitions. [2020-07-20 11:08:12,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1140 [2020-07-20 11:08:12,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:12,623 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 83, 83, 66, 64, 42, 42, 42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 25, 22, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:12,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:12,824 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:12,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:12,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1564534746, now seen corresponding path program 26 times [2020-07-20 11:08:12,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:12,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105532950] [2020-07-20 11:08:12,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:14,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:14,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 2532 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:08:14,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:15,191 INFO L134 CoverageAnalysis]: Checked inductivity of 38441 backedges. 1181 proven. 2705 refuted. 0 times theorem prover too weak. 34555 trivial. 0 not checked. [2020-07-20 11:08:15,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:19,326 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:08:19,437 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:08:19,553 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:08:19,669 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:08:19,778 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:08:27,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:31,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:31,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:31,808 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 11:08:33,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:33,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:34,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:34,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:35,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:35,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:35,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:35,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:35,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:36,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:36,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:36,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:38,930 INFO L134 CoverageAnalysis]: Checked inductivity of 38441 backedges. 1185 proven. 2741 refuted. 0 times theorem prover too weak. 34515 trivial. 0 not checked. [2020-07-20 11:08:38,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105532950] [2020-07-20 11:08:38,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:38,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:08:38,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841050668] [2020-07-20 11:08:38,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:08:38,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:38,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:08:38,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:08:38,933 INFO L87 Difference]: Start difference. First operand 275 states and 870 transitions. Second operand 23 states. [2020-07-20 11:08:40,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:40,123 INFO L93 Difference]: Finished difference Result 365 states and 1327 transitions. [2020-07-20 11:08:40,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:08:40,127 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1139 [2020-07-20 11:08:40,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:40,135 INFO L225 Difference]: With dead ends: 365 [2020-07-20 11:08:40,135 INFO L226 Difference]: Without dead ends: 356 [2020-07-20 11:08:40,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2286 GetRequests, 2237 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:08:40,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-07-20 11:08:40,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 271. [2020-07-20 11:08:40,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2020-07-20 11:08:40,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 816 transitions. [2020-07-20 11:08:40,184 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 816 transitions. Word has length 1139 [2020-07-20 11:08:40,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:40,184 INFO L479 AbstractCegarLoop]: Abstraction has 271 states and 816 transitions. [2020-07-20 11:08:40,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:08:40,184 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 816 transitions. [2020-07-20 11:08:40,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1129 [2020-07-20 11:08:40,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:40,197 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 81, 81, 66, 65, 42, 42, 42, 42, 42, 42, 42, 40, 40, 40, 40, 40, 40, 40, 26, 23, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:40,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:40,398 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:40,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:40,399 INFO L82 PathProgramCache]: Analyzing trace with hash 2042280373, now seen corresponding path program 27 times [2020-07-20 11:08:40,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:40,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215259411] [2020-07-20 11:08:40,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:41,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:41,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 2507 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:08:41,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:42,712 INFO L134 CoverageAnalysis]: Checked inductivity of 37693 backedges. 1492 proven. 2846 refuted. 0 times theorem prover too weak. 33355 trivial. 0 not checked. [2020-07-20 11:08:42,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:46,002 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:46,107 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:46,862 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:08:46,970 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:08:47,076 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 11:08:53,300 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:08:53,506 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:53,614 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:54,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:54,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:58,912 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:59,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:02,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:04,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:05,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:06,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:06,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:06,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:06,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:07,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:07,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:07,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:07,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:07,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:10,446 INFO L134 CoverageAnalysis]: Checked inductivity of 37693 backedges. 1494 proven. 2896 refuted. 0 times theorem prover too weak. 33303 trivial. 0 not checked. [2020-07-20 11:09:10,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215259411] [2020-07-20 11:09:10,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:09:10,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:09:10,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828475948] [2020-07-20 11:09:10,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:09:10,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:09:10,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:09:10,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:09:10,449 INFO L87 Difference]: Start difference. First operand 271 states and 816 transitions. Second operand 25 states. [2020-07-20 11:09:12,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:09:12,131 INFO L93 Difference]: Finished difference Result 387 states and 1232 transitions. [2020-07-20 11:09:12,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:09:12,135 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1128 [2020-07-20 11:09:12,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:09:12,143 INFO L225 Difference]: With dead ends: 387 [2020-07-20 11:09:12,143 INFO L226 Difference]: Without dead ends: 356 [2020-07-20 11:09:12,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2265 GetRequests, 2211 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:09:12,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-07-20 11:09:12,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 321. [2020-07-20 11:09:12,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 321 states. [2020-07-20 11:09:12,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 951 transitions. [2020-07-20 11:09:12,184 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 951 transitions. Word has length 1128 [2020-07-20 11:09:12,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:09:12,184 INFO L479 AbstractCegarLoop]: Abstraction has 321 states and 951 transitions. [2020-07-20 11:09:12,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:09:12,184 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 951 transitions. [2020-07-20 11:09:12,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1402 [2020-07-20 11:09:12,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:09:12,208 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 100, 100, 82, 82, 52, 52, 52, 52, 52, 52, 52, 50, 50, 50, 50, 50, 50, 50, 32, 30, 23, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:09:12,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:12,419 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:09:12,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:09:12,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1791734017, now seen corresponding path program 28 times [2020-07-20 11:09:12,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:09:12,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334670308] [2020-07-20 11:09:12,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:14,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:09:14,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 3113 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:09:14,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:09:15,111 INFO L134 CoverageAnalysis]: Checked inductivity of 58486 backedges. 1139 proven. 3147 refuted. 0 times theorem prover too weak. 54200 trivial. 0 not checked. [2020-07-20 11:09:15,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:09:29,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:29,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:35,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:35,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:36,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:36,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:37,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:37,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:38,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:38,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:38,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:39,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:39,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:42,557 INFO L134 CoverageAnalysis]: Checked inductivity of 58486 backedges. 1141 proven. 3177 refuted. 0 times theorem prover too weak. 54168 trivial. 0 not checked. [2020-07-20 11:09:42,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334670308] [2020-07-20 11:09:42,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:09:42,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:09:42,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224941944] [2020-07-20 11:09:42,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:09:42,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:09:42,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:09:42,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:09:42,560 INFO L87 Difference]: Start difference. First operand 321 states and 951 transitions. Second operand 21 states. [2020-07-20 11:09:43,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:09:43,664 INFO L93 Difference]: Finished difference Result 520 states and 2089 transitions. [2020-07-20 11:09:43,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:09:43,668 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1401 [2020-07-20 11:09:43,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:09:43,682 INFO L225 Difference]: With dead ends: 520 [2020-07-20 11:09:43,682 INFO L226 Difference]: Without dead ends: 511 [2020-07-20 11:09:43,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2809 GetRequests, 2765 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:09:43,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2020-07-20 11:09:43,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 316. [2020-07-20 11:09:43,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 11:09:43,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 907 transitions. [2020-07-20 11:09:43,737 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 907 transitions. Word has length 1401 [2020-07-20 11:09:43,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:09:43,738 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 907 transitions. [2020-07-20 11:09:43,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:09:43,738 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 907 transitions. [2020-07-20 11:09:43,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1691 [2020-07-20 11:09:43,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:09:43,762 INFO L422 BasicCegarLoop]: trace histogram [125, 125, 122, 122, 102, 99, 62, 62, 62, 62, 62, 62, 62, 61, 61, 61, 61, 61, 61, 61, 40, 38, 26, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:09:43,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:43,963 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:09:43,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:09:43,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1443200698, now seen corresponding path program 29 times [2020-07-20 11:09:43,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:09:43,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170351474] [2020-07-20 11:09:43,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:45,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:09:45,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 3754 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:09:45,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:09:47,006 INFO L134 CoverageAnalysis]: Checked inductivity of 85410 backedges. 1094 proven. 3546 refuted. 0 times theorem prover too weak. 80770 trivial. 0 not checked. [2020-07-20 11:09:47,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:10:05,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:12,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:12,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:13,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:13,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:13,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:15,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:18,341 INFO L134 CoverageAnalysis]: Checked inductivity of 85410 backedges. 1096 proven. 3568 refuted. 0 times theorem prover too weak. 80746 trivial. 0 not checked. [2020-07-20 11:10:18,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170351474] [2020-07-20 11:10:18,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:10:18,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:10:18,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529501614] [2020-07-20 11:10:18,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:10:18,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:10:18,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:10:18,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:10:18,344 INFO L87 Difference]: Start difference. First operand 316 states and 907 transitions. Second operand 19 states. [2020-07-20 11:10:19,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:10:19,458 INFO L93 Difference]: Finished difference Result 613 states and 2780 transitions. [2020-07-20 11:10:19,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:10:19,463 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1690 [2020-07-20 11:10:19,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:10:19,480 INFO L225 Difference]: With dead ends: 613 [2020-07-20 11:10:19,481 INFO L226 Difference]: Without dead ends: 604 [2020-07-20 11:10:19,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3347 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:10:19,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2020-07-20 11:10:19,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 318. [2020-07-20 11:10:19,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 11:10:19,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 927 transitions. [2020-07-20 11:10:19,542 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 927 transitions. Word has length 1690 [2020-07-20 11:10:19,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:10:19,543 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 927 transitions. [2020-07-20 11:10:19,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:10:19,543 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 927 transitions. [2020-07-20 11:10:19,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1247 [2020-07-20 11:10:19,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:10:19,564 INFO L422 BasicCegarLoop]: trace histogram [92, 92, 91, 91, 71, 70, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 25, 25, 22, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:10:19,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:19,765 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:10:19,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:10:19,767 INFO L82 PathProgramCache]: Analyzing trace with hash 172971970, now seen corresponding path program 30 times [2020-07-20 11:10:19,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:10:19,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725841677] [2020-07-20 11:10:19,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:21,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:10:21,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 2770 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:10:21,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:10:22,254 INFO L134 CoverageAnalysis]: Checked inductivity of 46124 backedges. 1401 proven. 2937 refuted. 0 times theorem prover too weak. 41786 trivial. 0 not checked. [2020-07-20 11:10:22,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:10:25,680 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:25,791 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:26,649 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:10:26,765 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:10:26,878 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:10:26,980 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 11:10:33,864 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:33,967 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:34,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:42,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:44,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:46,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:47,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:47,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:47,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:47,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:48,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:48,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:48,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:49,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:52,149 INFO L134 CoverageAnalysis]: Checked inductivity of 46124 backedges. 1411 proven. 2969 refuted. 0 times theorem prover too weak. 41744 trivial. 0 not checked. [2020-07-20 11:10:52,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725841677] [2020-07-20 11:10:52,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:10:52,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 11:10:52,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037173913] [2020-07-20 11:10:52,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:10:52,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:10:52,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:10:52,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:10:52,151 INFO L87 Difference]: Start difference. First operand 318 states and 927 transitions. Second operand 24 states. [2020-07-20 11:10:53,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:10:53,880 INFO L93 Difference]: Finished difference Result 634 states and 2511 transitions. [2020-07-20 11:10:53,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:10:53,885 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1246 [2020-07-20 11:10:53,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:10:53,902 INFO L225 Difference]: With dead ends: 634 [2020-07-20 11:10:53,903 INFO L226 Difference]: Without dead ends: 598 [2020-07-20 11:10:53,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2500 GetRequests, 2451 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:10:53,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2020-07-20 11:10:53,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 337. [2020-07-20 11:10:53,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-07-20 11:10:53,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 1041 transitions. [2020-07-20 11:10:53,958 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 1041 transitions. Word has length 1246 [2020-07-20 11:10:53,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:10:53,959 INFO L479 AbstractCegarLoop]: Abstraction has 337 states and 1041 transitions. [2020-07-20 11:10:53,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:10:53,959 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 1041 transitions. [2020-07-20 11:10:53,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 925 [2020-07-20 11:10:53,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:10:53,977 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 65, 65, 56, 51, 35, 35, 35, 35, 35, 35, 35, 32, 32, 32, 32, 32, 32, 32, 24, 16, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:10:54,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:54,191 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:10:54,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:10:54,192 INFO L82 PathProgramCache]: Analyzing trace with hash -663916192, now seen corresponding path program 31 times [2020-07-20 11:10:54,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:10:54,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915061028] [2020-07-20 11:10:54,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:55,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:10:55,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 2054 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:10:55,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:10:56,232 INFO L134 CoverageAnalysis]: Checked inductivity of 25159 backedges. 935 proven. 1513 refuted. 0 times theorem prover too weak. 22711 trivial. 0 not checked. [2020-07-20 11:10:56,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:10:56,399 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:11:06,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:06,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:10,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:10,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:10,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:11,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:12,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:12,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:12,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:12,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:12,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:13,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:16,211 INFO L134 CoverageAnalysis]: Checked inductivity of 25159 backedges. 935 proven. 1539 refuted. 0 times theorem prover too weak. 22685 trivial. 0 not checked. [2020-07-20 11:11:16,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915061028] [2020-07-20 11:11:16,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:16,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:11:16,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629321868] [2020-07-20 11:11:16,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:11:16,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:16,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:11:16,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:11:16,213 INFO L87 Difference]: Start difference. First operand 337 states and 1041 transitions. Second operand 19 states. [2020-07-20 11:11:17,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:17,441 INFO L93 Difference]: Finished difference Result 580 states and 2467 transitions. [2020-07-20 11:11:17,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:11:17,446 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 924 [2020-07-20 11:11:17,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:17,460 INFO L225 Difference]: With dead ends: 580 [2020-07-20 11:11:17,461 INFO L226 Difference]: Without dead ends: 571 [2020-07-20 11:11:17,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1854 GetRequests, 1815 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:11:17,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2020-07-20 11:11:17,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 348. [2020-07-20 11:11:17,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 11:11:17,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 1122 transitions. [2020-07-20 11:11:17,522 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 1122 transitions. Word has length 924 [2020-07-20 11:11:17,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:17,523 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 1122 transitions. [2020-07-20 11:11:17,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:11:17,523 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 1122 transitions. [2020-07-20 11:11:17,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1380 [2020-07-20 11:11:17,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:17,542 INFO L422 BasicCegarLoop]: trace histogram [104, 104, 97, 97, 83, 83, 52, 52, 52, 52, 52, 52, 52, 48, 48, 48, 48, 48, 48, 48, 35, 31, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:17,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:17,743 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:17,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:17,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1083464539, now seen corresponding path program 32 times [2020-07-20 11:11:17,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:17,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441793957] [2020-07-20 11:11:17,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:19,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:19,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 3063 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:11:19,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:11:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 56670 backedges. 786 proven. 4044 refuted. 0 times theorem prover too weak. 51840 trivial. 0 not checked. [2020-07-20 11:11:20,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:11:25,180 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:11:25,285 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:11:34,310 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:11:34,416 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:11:34,525 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:11:34,639 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:11:34,746 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:11:35,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:35,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:45,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:49,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:49,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:52,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:52,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:53,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:53,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:54,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:55,695 INFO L134 CoverageAnalysis]: Checked inductivity of 56670 backedges. 798 proven. 4072 refuted. 0 times theorem prover too weak. 51800 trivial. 0 not checked. [2020-07-20 11:11:55,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441793957] [2020-07-20 11:11:55,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:55,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:11:55,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075447408] [2020-07-20 11:11:55,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:11:55,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:55,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:11:55,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:11:55,697 INFO L87 Difference]: Start difference. First operand 348 states and 1122 transitions. Second operand 23 states. [2020-07-20 11:11:57,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:57,643 INFO L93 Difference]: Finished difference Result 856 states and 4565 transitions. [2020-07-20 11:11:57,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:11:57,649 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1379 [2020-07-20 11:11:57,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:57,668 INFO L225 Difference]: With dead ends: 856 [2020-07-20 11:11:57,669 INFO L226 Difference]: Without dead ends: 548 [2020-07-20 11:11:57,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2766 GetRequests, 2717 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:11:57,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2020-07-20 11:11:57,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 345. [2020-07-20 11:11:57,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 345 states. [2020-07-20 11:11:57,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 1097 transitions. [2020-07-20 11:11:57,741 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 1097 transitions. Word has length 1379 [2020-07-20 11:11:57,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:57,742 INFO L479 AbstractCegarLoop]: Abstraction has 345 states and 1097 transitions. [2020-07-20 11:11:57,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:11:57,742 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 1097 transitions. [2020-07-20 11:11:57,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1470 [2020-07-20 11:11:57,762 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:57,763 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 106, 106, 86, 86, 54, 54, 54, 54, 54, 54, 54, 53, 53, 53, 53, 53, 53, 53, 33, 32, 23, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:57,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:57,964 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:57,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:57,965 INFO L82 PathProgramCache]: Analyzing trace with hash -860079114, now seen corresponding path program 33 times [2020-07-20 11:11:57,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:57,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069623668] [2020-07-20 11:11:57,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:59,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 3264 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:11:59,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:12:00,854 INFO L134 CoverageAnalysis]: Checked inductivity of 64350 backedges. 1453 proven. 3720 refuted. 0 times theorem prover too weak. 59177 trivial. 0 not checked. [2020-07-20 11:12:00,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:12:04,941 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:05,049 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:05,166 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:05,283 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:06,551 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:12:06,673 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:12:06,804 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:12:06,934 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:12:07,062 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:12:07,178 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 11:12:07,287 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:12:17,146 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:12:17,808 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:17,916 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:18,034 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:18,150 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:18,264 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 11:12:18,367 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:12:18,470 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:18,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:28,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:28,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:30,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:32,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:32,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:33,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:33,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:34,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:34,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:34,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:34,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:34,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:35,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:36,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:39,461 INFO L134 CoverageAnalysis]: Checked inductivity of 64350 backedges. 1459 proven. 3754 refuted. 0 times theorem prover too weak. 59137 trivial. 0 not checked. [2020-07-20 11:12:39,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069623668] [2020-07-20 11:12:39,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:12:39,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:12:39,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861799100] [2020-07-20 11:12:39,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:12:39,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:12:39,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:12:39,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:12:39,463 INFO L87 Difference]: Start difference. First operand 345 states and 1097 transitions. Second operand 23 states. [2020-07-20 11:12:41,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:12:41,180 INFO L93 Difference]: Finished difference Result 509 states and 1717 transitions. [2020-07-20 11:12:41,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:12:41,186 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1469 [2020-07-20 11:12:41,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:12:41,198 INFO L225 Difference]: With dead ends: 509 [2020-07-20 11:12:41,198 INFO L226 Difference]: Without dead ends: 473 [2020-07-20 11:12:41,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2946 GetRequests, 2897 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:12:41,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2020-07-20 11:12:41,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 300. [2020-07-20 11:12:41,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 11:12:41,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 889 transitions. [2020-07-20 11:12:41,250 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 889 transitions. Word has length 1469 [2020-07-20 11:12:41,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:12:41,250 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 889 transitions. [2020-07-20 11:12:41,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:12:41,250 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 889 transitions. [2020-07-20 11:12:41,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1290 [2020-07-20 11:12:41,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:12:41,267 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 89, 89, 69, 67, 51, 51, 51, 51, 51, 51, 51, 44, 44, 44, 44, 44, 44, 44, 35, 23, 20, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:12:41,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:12:41,468 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:12:41,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:12:41,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1635717440, now seen corresponding path program 34 times [2020-07-20 11:12:41,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:12:41,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723398798] [2020-07-20 11:12:41,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:12:43,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:12:43,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 2868 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:12:43,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:12:44,170 INFO L134 CoverageAnalysis]: Checked inductivity of 49709 backedges. 1178 proven. 2765 refuted. 0 times theorem prover too weak. 45766 trivial. 0 not checked. [2020-07-20 11:12:44,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:12:48,859 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:48,966 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:59,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:59,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:05,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:06,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:06,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:08,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:08,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:10,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:14,067 INFO L134 CoverageAnalysis]: Checked inductivity of 49709 backedges. 1182 proven. 2791 refuted. 0 times theorem prover too weak. 45736 trivial. 0 not checked. [2020-07-20 11:13:14,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723398798] [2020-07-20 11:13:14,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:14,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:13:14,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140197373] [2020-07-20 11:13:14,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:13:14,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:14,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:13:14,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:13:14,069 INFO L87 Difference]: Start difference. First operand 300 states and 889 transitions. Second operand 21 states. [2020-07-20 11:13:15,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:15,296 INFO L93 Difference]: Finished difference Result 441 states and 1604 transitions. [2020-07-20 11:13:15,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:13:15,302 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1289 [2020-07-20 11:13:15,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:15,312 INFO L225 Difference]: With dead ends: 441 [2020-07-20 11:13:15,313 INFO L226 Difference]: Without dead ends: 432 [2020-07-20 11:13:15,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2585 GetRequests, 2541 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:13:15,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-20 11:13:15,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 295. [2020-07-20 11:13:15,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2020-07-20 11:13:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 855 transitions. [2020-07-20 11:13:15,357 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 855 transitions. Word has length 1289 [2020-07-20 11:13:15,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:15,357 INFO L479 AbstractCegarLoop]: Abstraction has 295 states and 855 transitions. [2020-07-20 11:13:15,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:13:15,358 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 855 transitions. [2020-07-20 11:13:15,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1095 [2020-07-20 11:13:15,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:15,371 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 77, 77, 61, 60, 42, 42, 42, 42, 42, 42, 42, 38, 38, 38, 38, 38, 38, 38, 23, 23, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:13:15,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:15,572 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:15,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:15,573 INFO L82 PathProgramCache]: Analyzing trace with hash 303435387, now seen corresponding path program 35 times [2020-07-20 11:13:15,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:15,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029826624] [2020-07-20 11:13:15,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:17,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:17,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 2433 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:13:17,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:17,901 INFO L134 CoverageAnalysis]: Checked inductivity of 35504 backedges. 1162 proven. 2149 refuted. 0 times theorem prover too weak. 32193 trivial. 0 not checked. [2020-07-20 11:13:17,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:21,322 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:13:21,522 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:13:21,634 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:13:21,740 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:13:30,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:35,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:36,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:38,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:39,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:40,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:44,131 INFO L134 CoverageAnalysis]: Checked inductivity of 35504 backedges. 1166 proven. 2177 refuted. 0 times theorem prover too weak. 32161 trivial. 0 not checked. [2020-07-20 11:13:44,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029826624] [2020-07-20 11:13:44,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:44,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:13:44,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640740915] [2020-07-20 11:13:44,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:13:44,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:44,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:13:44,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:13:44,134 INFO L87 Difference]: Start difference. First operand 295 states and 855 transitions. Second operand 21 states. [2020-07-20 11:13:45,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:45,344 INFO L93 Difference]: Finished difference Result 389 states and 1221 transitions. [2020-07-20 11:13:45,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:13:45,350 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1094 [2020-07-20 11:13:45,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:45,357 INFO L225 Difference]: With dead ends: 389 [2020-07-20 11:13:45,357 INFO L226 Difference]: Without dead ends: 380 [2020-07-20 11:13:45,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2195 GetRequests, 2151 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:13:45,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2020-07-20 11:13:45,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 280. [2020-07-20 11:13:45,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 11:13:45,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 762 transitions. [2020-07-20 11:13:45,390 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 762 transitions. Word has length 1094 [2020-07-20 11:13:45,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:45,391 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 762 transitions. [2020-07-20 11:13:45,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:13:45,391 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 762 transitions. [2020-07-20 11:13:45,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 913 [2020-07-20 11:13:45,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:45,404 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 65, 65, 55, 52, 34, 34, 34, 34, 34, 34, 34, 32, 32, 32, 32, 32, 32, 32, 23, 18, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:13:45,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:45,610 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:45,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:45,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1608497507, now seen corresponding path program 36 times [2020-07-20 11:13:45,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:45,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329118611] [2020-07-20 11:13:45,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in