/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:45:03,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:45:03,201 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:45:03,221 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:45:03,222 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:45:03,224 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:45:03,226 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:45:03,240 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:45:03,242 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:45:03,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:45:03,245 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:45:03,247 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:45:03,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:45:03,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:45:03,249 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:45:03,251 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:45:03,251 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:45:03,252 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:45:03,254 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:45:03,255 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:45:03,257 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:45:03,258 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:45:03,259 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:45:03,260 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:45:03,262 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:45:03,269 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:45:03,270 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:45:03,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:45:03,272 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 10:45:03,286 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:45:03,286 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:45:03,287 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:45:03,287 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:45:03,288 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:45:03,288 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:45:03,288 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:45:03,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:45:03,289 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:45:03,290 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:45:03,290 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:45:03,290 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:45:03,290 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:45:03,290 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:45:03,291 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:45:03,291 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:45:03,291 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:45:03,291 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:45:03,291 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:45:03,292 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:45:03,292 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:45:03,292 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:03,292 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:45:03,292 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:45:03,293 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 10:45:03,571 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:45:03,584 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:45:03,587 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:45:03,589 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:45:03,589 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:45:03,590 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 10:45:03,652 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76687da46/5774bc4c00e14fc6b8a6a3a637504f3e/FLAG8ad84510b [2020-07-21 10:45:04,058 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:45:04,060 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 10:45:04,068 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76687da46/5774bc4c00e14fc6b8a6a3a637504f3e/FLAG8ad84510b [2020-07-21 10:45:04,424 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76687da46/5774bc4c00e14fc6b8a6a3a637504f3e [2020-07-21 10:45:04,436 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:45:04,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:45:04,441 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:45:04,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:45:04,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:45:04,446 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,450 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3776624 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04, skipping insertion in model container [2020-07-21 10:45:04,450 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,459 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:45:04,479 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:45:04,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:45:04,715 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:45:04,731 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:45:04,747 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:45:04,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04 WrapperNode [2020-07-21 10:45:04,747 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:45:04,748 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:45:04,748 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:45:04,749 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:45:04,763 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,764 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,773 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,779 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,780 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... [2020-07-21 10:45:04,781 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:45:04,781 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:45:04,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:45:04,782 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:45:04,783 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:45:04,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:45:04,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:45:04,932 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 10:45:04,932 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:45:04,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:45:04,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:45:04,933 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 10:45:04,934 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:45:04,934 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:45:04,935 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:45:05,124 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:45:05,124 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:45:05,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:45:05 BoogieIcfgContainer [2020-07-21 10:45:05,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:45:05,129 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:45:05,129 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:45:05,132 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:45:05,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:45:04" (1/3) ... [2020-07-21 10:45:05,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40d641ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:45:05, skipping insertion in model container [2020-07-21 10:45:05,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:45:04" (2/3) ... [2020-07-21 10:45:05,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40d641ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:45:05, skipping insertion in model container [2020-07-21 10:45:05,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:45:05" (3/3) ... [2020-07-21 10:45:05,136 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-2.c [2020-07-21 10:45:05,146 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:45:05,154 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:45:05,168 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:45:05,192 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:45:05,193 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:45:05,193 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:45:05,193 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:45:05,193 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:45:05,193 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:45:05,194 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:45:05,194 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:45:05,210 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 10:45:05,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:45:05,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:05,216 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:05,216 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:05,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:05,221 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 10:45:05,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:05,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966001244] [2020-07-21 10:45:05,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:05,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:05,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:45:05,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:05,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:45:05,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:45:05,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966001244] [2020-07-21 10:45:05,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:45:05,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:45:05,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338283482] [2020-07-21 10:45:05,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:45:05,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:05,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:45:05,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:45:05,433 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 10:45:05,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:05,533 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 10:45:05,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:45:05,535 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:45:05,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:05,547 INFO L225 Difference]: With dead ends: 35 [2020-07-21 10:45:05,547 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 10:45:05,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:45:05,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 10:45:05,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 10:45:05,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:45:05,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:45:05,610 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 10:45:05,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:05,611 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:45:05,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:45:05,611 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:45:05,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:45:05,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:05,613 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:05,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:05,831 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:05,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:05,832 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 10:45:05,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:05,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705152405] [2020-07-21 10:45:05,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:05,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:45:05,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:05,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:45:05,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:45:05,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705152405] [2020-07-21 10:45:05,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:45:05,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:45:05,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112294878] [2020-07-21 10:45:05,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:45:05,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:05,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:45:05,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:45:05,924 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 10:45:06,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:06,004 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 10:45:06,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:45:06,005 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:45:06,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:06,006 INFO L225 Difference]: With dead ends: 27 [2020-07-21 10:45:06,006 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 10:45:06,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:45:06,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 10:45:06,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 10:45:06,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:45:06,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:45:06,016 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 10:45:06,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:06,016 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:45:06,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:45:06,017 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:45:06,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:45:06,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:06,018 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:06,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:06,234 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:06,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:06,236 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 10:45:06,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:06,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434638193] [2020-07-21 10:45:06,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:06,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:06,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:45:06,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:06,331 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:45:06,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:06,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,552 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:45:06,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434638193] [2020-07-21 10:45:06,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:06,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:45:06,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726388545] [2020-07-21 10:45:06,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:45:06,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:06,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:45:06,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:45:06,556 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 10:45:06,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:06,655 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 10:45:06,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:45:06,656 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:45:06,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:06,658 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:45:06,658 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:45:06,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:45:06,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:45:06,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 10:45:06,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:45:06,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:45:06,668 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 10:45:06,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:06,669 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:45:06,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:45:06,669 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:45:06,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:45:06,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:06,671 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:06,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:06,885 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:06,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:06,887 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 10:45:06,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:06,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14241497] [2020-07-21 10:45:06,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:06,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:06,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:45:06,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:06,974 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 10:45:06,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:07,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,172 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:45:07,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14241497] [2020-07-21 10:45:07,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:07,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:45:07,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637062446] [2020-07-21 10:45:07,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:45:07,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:07,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:45:07,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:45:07,175 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 10:45:07,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:07,278 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 10:45:07,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:45:07,280 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 10:45:07,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:07,286 INFO L225 Difference]: With dead ends: 37 [2020-07-21 10:45:07,286 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 10:45:07,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:45:07,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 10:45:07,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 10:45:07,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:45:07,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:45:07,304 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 10:45:07,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:07,305 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:45:07,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:45:07,305 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:45:07,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:45:07,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:07,309 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:07,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:07,512 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:07,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:07,513 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 10:45:07,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:07,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474801519] [2020-07-21 10:45:07,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:07,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:07,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:45:07,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:07,598 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 10:45:07,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:07,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,928 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:45:07,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474801519] [2020-07-21 10:45:07,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:07,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:45:07,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699217508] [2020-07-21 10:45:07,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:45:07,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:07,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:45:07,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:45:07,931 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 10:45:08,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:08,079 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 10:45:08,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:45:08,079 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 10:45:08,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:08,081 INFO L225 Difference]: With dead ends: 42 [2020-07-21 10:45:08,081 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 10:45:08,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:45:08,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 10:45:08,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 10:45:08,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:45:08,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:45:08,092 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 10:45:08,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:08,093 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:45:08,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:45:08,093 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:45:08,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 10:45:08,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:08,095 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:08,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:08,309 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:08,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:08,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 10:45:08,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:08,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528807000] [2020-07-21 10:45:08,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:08,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:08,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:45:08,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 10:45:08,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:08,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:08,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:08,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:08,733 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:45:08,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528807000] [2020-07-21 10:45:08,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:08,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:45:08,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188386647] [2020-07-21 10:45:08,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:45:08,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:08,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:45:08,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:45:08,737 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 10:45:08,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:08,875 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 10:45:08,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:45:08,875 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 10:45:08,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:08,877 INFO L225 Difference]: With dead ends: 47 [2020-07-21 10:45:08,877 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 10:45:08,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:45:08,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 10:45:08,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 10:45:08,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:45:08,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:45:08,888 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 10:45:08,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:08,889 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:45:08,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:45:08,889 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:45:08,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 10:45:08,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:08,892 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:09,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:09,099 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:09,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:09,099 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 10:45:09,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:09,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515421487] [2020-07-21 10:45:09,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:09,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:09,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:45:09,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:09,207 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 10:45:09,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:09,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,823 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 10:45:09,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515421487] [2020-07-21 10:45:09,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:09,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:45:09,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469531135] [2020-07-21 10:45:09,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:45:09,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:09,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:45:09,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:45:09,826 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 10:45:10,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:10,029 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 10:45:10,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:45:10,030 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 10:45:10,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:10,035 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:45:10,036 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 10:45:10,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:45:10,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 10:45:10,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 10:45:10,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:45:10,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:45:10,064 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 10:45:10,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:10,065 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:45:10,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:45:10,067 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:45:10,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 10:45:10,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:10,077 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:10,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:10,278 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:10,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:10,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 10:45:10,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:10,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534825979] [2020-07-21 10:45:10,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:10,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:10,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:45:10,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:10,400 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 10:45:10,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:10,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:10,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:10,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:11,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:11,061 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 10:45:11,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534825979] [2020-07-21 10:45:11,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:11,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:45:11,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585740547] [2020-07-21 10:45:11,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:45:11,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:11,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:45:11,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:45:11,064 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 10:45:11,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:11,194 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 10:45:11,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:45:11,194 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 10:45:11,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:11,197 INFO L225 Difference]: With dead ends: 57 [2020-07-21 10:45:11,197 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 10:45:11,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:45:11,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 10:45:11,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 10:45:11,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:45:11,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:45:11,220 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 10:45:11,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:11,221 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:45:11,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:45:11,221 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:45:11,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 10:45:11,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:11,223 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:11,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:11,440 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:11,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:11,441 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 10:45:11,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:11,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585470598] [2020-07-21 10:45:11,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:11,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:11,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:45:11,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:11,589 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 10:45:11,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:12,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:12,529 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 10:45:12,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585470598] [2020-07-21 10:45:12,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:12,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:45:12,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640850485] [2020-07-21 10:45:12,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:45:12,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:12,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:45:12,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:45:12,532 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 10:45:12,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:12,821 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 10:45:12,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:45:12,822 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 10:45:12,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:12,825 INFO L225 Difference]: With dead ends: 62 [2020-07-21 10:45:12,826 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 10:45:12,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:45:12,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 10:45:12,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 10:45:12,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:45:12,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:45:12,840 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 10:45:12,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:12,840 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:45:12,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:45:12,840 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:45:12,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 10:45:12,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:12,843 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:13,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:13,059 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:13,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:13,059 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 10:45:13,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:13,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670363014] [2020-07-21 10:45:13,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:13,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:13,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:45:13,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:13,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 10:45:13,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:13,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:14,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 10:45:14,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670363014] [2020-07-21 10:45:14,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:14,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:45:14,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897665227] [2020-07-21 10:45:14,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:45:14,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:14,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:45:14,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:45:14,281 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 10:45:14,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:14,466 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 10:45:14,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:45:14,467 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 10:45:14,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:14,471 INFO L225 Difference]: With dead ends: 67 [2020-07-21 10:45:14,471 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 10:45:14,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:45:14,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 10:45:14,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 10:45:14,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:45:14,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:45:14,484 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 10:45:14,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:14,485 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:45:14,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:45:14,485 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:45:14,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 10:45:14,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:14,490 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:14,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:14,704 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:14,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:14,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 10:45:14,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:14,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631362061] [2020-07-21 10:45:14,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:14,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:14,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:45:14,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:14,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 10:45:14,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:16,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 10:45:16,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631362061] [2020-07-21 10:45:16,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:16,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:45:16,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870479227] [2020-07-21 10:45:16,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:45:16,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:16,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:45:16,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:45:16,763 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 10:45:16,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:16,975 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 10:45:16,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:45:16,975 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 10:45:16,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:16,979 INFO L225 Difference]: With dead ends: 72 [2020-07-21 10:45:16,979 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 10:45:16,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:16,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 10:45:17,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 10:45:17,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:45:17,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:45:17,005 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 10:45:17,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:17,007 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:45:17,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:45:17,008 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:45:17,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 10:45:17,016 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:17,016 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:17,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:17,231 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:17,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:17,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 10:45:17,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:17,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871917081] [2020-07-21 10:45:17,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:17,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:45:17,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:17,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 10:45:17,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:18,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 10:45:19,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871917081] [2020-07-21 10:45:19,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:19,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:45:19,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864749312] [2020-07-21 10:45:19,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:45:19,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:19,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:45:19,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:45:19,478 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 10:45:19,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:19,707 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 10:45:19,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:45:19,708 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 10:45:19,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:19,716 INFO L225 Difference]: With dead ends: 77 [2020-07-21 10:45:19,716 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 10:45:19,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:19,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 10:45:19,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 10:45:19,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:45:19,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:45:19,745 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 10:45:19,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:19,746 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:45:19,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:45:19,746 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:45:19,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 10:45:19,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:19,759 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:19,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:19,973 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:19,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:19,973 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 10:45:19,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:19,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556300889] [2020-07-21 10:45:19,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:20,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:20,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:45:20,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:20,342 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 10:45:20,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:22,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 10:45:23,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556300889] [2020-07-21 10:45:23,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:23,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:45:23,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138352040] [2020-07-21 10:45:23,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:45:23,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:23,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:45:23,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:45:23,482 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 10:45:23,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:23,833 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 10:45:23,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:45:23,834 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 10:45:23,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:23,837 INFO L225 Difference]: With dead ends: 82 [2020-07-21 10:45:23,838 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 10:45:23,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:45:23,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 10:45:23,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 10:45:23,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:45:23,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:45:23,852 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 10:45:23,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:23,854 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:45:23,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:45:23,854 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:45:23,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 10:45:23,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:23,859 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:24,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:24,060 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:24,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:24,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 10:45:24,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:24,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912013647] [2020-07-21 10:45:24,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:24,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:24,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:45:24,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:24,469 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 10:45:24,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:26,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:26,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:26,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:27,602 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 10:45:27,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912013647] [2020-07-21 10:45:27,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:27,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:45:27,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472290454] [2020-07-21 10:45:27,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:45:27,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:27,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:45:27,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:45:27,605 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 10:45:28,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:28,091 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 10:45:28,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:45:28,092 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 10:45:28,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:28,098 INFO L225 Difference]: With dead ends: 87 [2020-07-21 10:45:28,098 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 10:45:28,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:45:28,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 10:45:28,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 10:45:28,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:45:28,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:45:28,135 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 10:45:28,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:28,136 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:45:28,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:45:28,137 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:45:28,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 10:45:28,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:28,147 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:28,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:28,364 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:28,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:28,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 10:45:28,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:28,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050205385] [2020-07-21 10:45:28,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:28,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:28,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1944 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:45:28,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:29,242 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 10:45:29,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:32,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:32,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,865 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 10:45:34,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050205385] [2020-07-21 10:45:34,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:34,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:34,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972409409] [2020-07-21 10:45:34,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:34,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:34,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:34,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:34,870 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 10:45:35,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:35,313 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 10:45:35,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:35,316 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 10:45:35,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:35,321 INFO L225 Difference]: With dead ends: 92 [2020-07-21 10:45:35,321 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 10:45:35,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:45:35,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 10:45:35,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 10:45:35,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:35,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:35,336 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 10:45:35,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:35,338 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:35,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:35,338 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:35,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 10:45:35,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:35,350 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:35,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:35,566 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:35,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:35,566 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 10:45:35,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:35,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500081901] [2020-07-21 10:45:35,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:36,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:36,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 2392 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:45:36,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:36,568 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 10:45:36,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:40,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:40,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:41,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:41,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:41,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:42,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:42,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:42,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:42,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:42,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:43,664 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 10:45:43,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500081901] [2020-07-21 10:45:43,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:43,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:43,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434750465] [2020-07-21 10:45:43,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:43,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:43,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:43,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:43,669 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 10:45:44,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:44,273 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 10:45:44,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:44,274 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 10:45:44,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:44,279 INFO L225 Difference]: With dead ends: 97 [2020-07-21 10:45:44,280 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 10:45:44,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:45:44,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 10:45:44,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 10:45:44,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:44,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:44,301 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 10:45:44,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:44,303 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:44,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:44,303 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:44,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 10:45:44,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:44,351 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:44,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:44,566 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:44,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:44,566 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 10:45:44,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:44,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668163462] [2020-07-21 10:45:44,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:45,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:45,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 3510 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:45,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:46,101 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 10:45:46,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:50,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:53,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:54,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:54,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:54,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:56,499 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 10:45:56,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668163462] [2020-07-21 10:45:56,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:56,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:45:56,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709917574] [2020-07-21 10:45:56,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:45:56,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:56,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:45:56,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:56,503 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 10:45:57,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:57,295 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 10:45:57,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:45:57,295 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 10:45:57,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:57,302 INFO L225 Difference]: With dead ends: 102 [2020-07-21 10:45:57,303 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 10:45:57,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:45:57,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 10:45:57,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 10:45:57,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:45:57,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:45:57,319 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 10:45:57,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:57,322 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:45:57,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:45:57,322 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:45:57,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 10:45:57,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:57,351 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:57,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:57,564 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:57,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:57,565 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 10:45:57,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:57,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720789456] [2020-07-21 10:45:57,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:58,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:58,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 4090 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:58,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:59,675 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 10:45:59,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:05,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:07,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:07,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:09,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:09,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:10,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 10:46:11,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720789456] [2020-07-21 10:46:11,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:11,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:46:11,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136851910] [2020-07-21 10:46:11,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:46:11,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:11,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:46:11,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:46:11,825 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 10:46:12,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:12,333 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 10:46:12,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:46:12,334 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 10:46:12,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:12,341 INFO L225 Difference]: With dead ends: 107 [2020-07-21 10:46:12,341 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 10:46:12,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:46:12,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 10:46:12,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 10:46:12,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:46:12,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:46:12,357 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 10:46:12,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:12,359 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:46:12,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:46:12,360 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:46:12,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 10:46:12,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:12,399 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:12,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:12,615 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:12,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:12,617 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 10:46:12,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:12,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352122060] [2020-07-21 10:46:12,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:13,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:13,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 4699 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:46:13,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:15,697 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 10:46:15,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:22,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:26,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:28,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:28,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:28,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:29,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:29,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:29,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:29,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:30,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:30,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:30,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:31,975 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 10:46:31,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352122060] [2020-07-21 10:46:31,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:31,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:31,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738768258] [2020-07-21 10:46:31,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:31,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:31,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:31,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:31,979 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 10:46:32,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:32,683 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 10:46:32,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:32,685 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 10:46:32,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:32,692 INFO L225 Difference]: With dead ends: 112 [2020-07-21 10:46:32,692 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 10:46:32,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:32,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 10:46:32,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 10:46:32,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:32,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:32,719 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 10:46:32,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:32,721 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:32,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:32,722 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:32,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 10:46:32,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:32,768 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:32,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:32,983 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:32,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:32,984 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 10:46:32,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:32,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32863437] [2020-07-21 10:46:32,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:33,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:33,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 4897 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:46:33,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:35,684 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 10:46:35,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:42,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:46,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:48,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:48,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:49,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:50,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:52,466 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 10:46:52,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32863437] [2020-07-21 10:46:52,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:52,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:52,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500145537] [2020-07-21 10:46:52,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:52,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:52,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:52,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:52,477 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 10:46:53,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:53,293 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 10:46:53,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:53,294 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 10:46:53,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:53,301 INFO L225 Difference]: With dead ends: 117 [2020-07-21 10:46:53,301 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 10:46:53,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:53,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 10:46:53,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 10:46:53,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:53,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:53,321 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 10:46:53,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:53,323 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:53,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:53,323 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:53,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 10:46:53,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:53,455 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:53,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:53,670 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:53,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:53,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 10:46:53,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:53,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863825730] [2020-07-21 10:46:53,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:55,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:55,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 8875 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:46:55,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:47:00,227 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 10:47:00,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:47:06,924 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:47:15,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:15,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:22,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:25,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:27,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:29,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:29,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:29,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:30,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:30,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:30,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:30,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:35,284 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 10:47:35,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863825730] [2020-07-21 10:47:35,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:47:35,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:47:35,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454279241] [2020-07-21 10:47:35,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:47:35,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:47:35,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:47:35,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:47:35,288 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 10:47:36,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:47:36,433 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 10:47:36,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:47:36,435 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 10:47:36,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:47:36,444 INFO L225 Difference]: With dead ends: 122 [2020-07-21 10:47:36,444 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 10:47:36,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:47:36,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 10:47:36,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 10:47:36,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:47:36,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:47:36,468 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 10:47:36,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:47:36,471 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:47:36,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:47:36,471 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:47:36,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5062 [2020-07-21 10:47:36,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:47:36,747 INFO L422 BasicCegarLoop]: trace histogram [737, 737, 632, 368, 368, 368, 368, 368, 368, 368, 264, 105, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:47:36,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:36,961 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:47:36,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:47:36,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1250597211, now seen corresponding path program 10 times [2020-07-21 10:47:36,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:47:36,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844565872] [2020-07-21 10:47:36,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:38,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:47:38,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 11230 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:47:38,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:47:46,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40185 refuted. 0 times theorem prover too weak. 1509018 trivial. 0 not checked. [2020-07-21 10:47:46,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:48:03,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:13,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:13,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:18,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:18,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:20,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:20,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:22,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:22,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:23,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:24,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:32,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40340 refuted. 0 times theorem prover too weak. 1508863 trivial. 0 not checked. [2020-07-21 10:48:32,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844565872] [2020-07-21 10:48:32,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:48:32,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:48:32,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359884603] [2020-07-21 10:48:32,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:48:32,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:48:32,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:48:32,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:48:32,189 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 10:48:33,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:48:33,727 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 10:48:33,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:48:33,732 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5061 [2020-07-21 10:48:33,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:48:33,742 INFO L225 Difference]: With dead ends: 127 [2020-07-21 10:48:33,742 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 10:48:33,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10132 GetRequests, 10074 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:48:33,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 10:48:33,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 10:48:33,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:48:33,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:48:33,765 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5061 [2020-07-21 10:48:33,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:48:33,768 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:48:33,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:48:33,769 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:48:34,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10297 [2020-07-21 10:48:34,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:48:34,270 INFO L422 BasicCegarLoop]: trace histogram [1583, 1583, 792, 791, 791, 791, 791, 791, 791, 791, 791, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:48:34,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:34,471 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:48:34,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:48:34,475 INFO L82 PathProgramCache]: Analyzing trace with hash -862919848, now seen corresponding path program 11 times [2020-07-21 10:48:34,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:48:34,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386205307] [2020-07-21 10:48:34,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:38,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:48:38,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 22969 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:48:38,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:49:08,830 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88343 refuted. 0 times theorem prover too weak. 6471084 trivial. 0 not checked. [2020-07-21 10:49:08,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:49:50,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:15,869 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 10:50:16,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:31,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:31,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:37,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:37,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:42,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:44,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:44,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:46,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:46,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:47,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:47,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:47,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:47,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:47,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:18,775 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88519 refuted. 0 times theorem prover too weak. 6470908 trivial. 0 not checked. [2020-07-21 10:51:18,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386205307] [2020-07-21 10:51:18,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:51:18,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:51:18,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745207928] [2020-07-21 10:51:18,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:51:18,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:51:18,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:51:18,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:51:18,787 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 10:51:21,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:51:21,522 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 10:51:21,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:51:21,525 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10296 [2020-07-21 10:51:21,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:51:21,536 INFO L225 Difference]: With dead ends: 132 [2020-07-21 10:51:21,537 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 10:51:21,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20604 GetRequests, 20541 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:51:21,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 10:51:21,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 10:51:21,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:51:21,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:51:21,564 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10296 [2020-07-21 10:51:21,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:51:21,573 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:51:21,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:51:21,573 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:51:21,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7906 [2020-07-21 10:51:21,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:51:21,940 INFO L422 BasicCegarLoop]: trace histogram [1169, 1169, 884, 584, 584, 584, 584, 584, 584, 584, 300, 285, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:51:22,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:22,141 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:51:22,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:51:22,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1408911547, now seen corresponding path program 11 times [2020-07-21 10:51:22,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:51:22,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635003339] [2020-07-21 10:51:22,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:25,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:51:25,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 17566 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:51:25,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:51:47,599 INFO L134 CoverageAnalysis]: Checked inductivity of 3802014 backedges. 8534 proven. 69091 refuted. 0 times theorem prover too weak. 3724389 trivial. 0 not checked. [2020-07-21 10:51:47,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:52:23,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:23,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:29,033 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:52:37,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:49,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:49,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:56,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:56,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:01,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:01,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:03,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:03,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:05,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:06,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:53:25,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3802014 backedges. 8534 proven. 69278 refuted. 0 times theorem prover too weak. 3724202 trivial. 0 not checked. [2020-07-21 10:53:25,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635003339] [2020-07-21 10:53:25,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:53:25,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:53:25,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665775513] [2020-07-21 10:53:25,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:53:25,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:53:25,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:53:25,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:53:25,838 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 10:53:27,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:53:27,191 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 10:53:27,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:53:27,193 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7905 [2020-07-21 10:53:27,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:53:27,206 INFO L225 Difference]: With dead ends: 137 [2020-07-21 10:53:27,206 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 10:53:27,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15821 GetRequests, 15758 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:53:27,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 10:53:27,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 10:53:27,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:53:27,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:53:27,240 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7905 [2020-07-21 10:53:27,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:53:27,245 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:53:27,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:53:27,245 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:53:29,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14236 [2020-07-21 10:53:29,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:53:29,517 INFO L422 BasicCegarLoop]: trace histogram [2189, 2189, 1095, 1094, 1094, 1094, 1094, 1094, 1094, 1094, 1094, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:53:29,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:53:29,733 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:53:29,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:53:29,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1698180357, now seen corresponding path program 12 times [2020-07-21 10:53:29,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:53:29,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380174157] [2020-07-21 10:53:29,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:53:34,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:53:34,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 31756 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:53:34,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:54:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 12568419 backedges. 16381 proven. 133757 refuted. 0 times theorem prover too weak. 12418281 trivial. 0 not checked. [2020-07-21 10:54:31,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:54:41,580 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 10:54:45,766 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:54:45,874 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:54:45,985 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:54:46,100 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:54:54,229 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 10:54:54,347 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 10:54:54,476 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:54:54,600 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:54:54,722 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 10:54:54,838 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 10:54:54,945 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 10:56:12,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:40,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:40,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:52,834 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:57:07,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:07,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:17,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:25,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:29,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:31,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:32,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:57:33,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts