/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_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:51:05,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:51:05,408 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:51:05,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:51:05,425 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:51:05,427 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:51:05,429 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:51:05,433 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:51:05,437 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:51:05,438 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:51:05,445 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:51:05,446 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:51:05,447 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:51:05,452 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:51:05,453 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:51:05,455 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:51:05,456 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:51:05,460 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:51:05,462 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:51:05,471 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:51:05,473 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:51:05,476 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:51:05,478 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:51:05,481 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:51:05,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:51:05,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:51:05,501 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:51:05,503 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:51:05,504 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 10:51:05,547 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:51:05,547 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:51:05,549 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:51:05,552 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:51:05,553 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:51:05,553 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:51:05,553 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:51:05,553 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:51:05,554 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:51:05,554 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:51:05,554 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:51:05,554 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:51:05,554 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:51:05,555 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:51:05,555 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:51:05,555 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:51:05,560 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:51:05,561 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:51:05,561 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:51:05,561 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:51:05,561 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:51:05,562 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:51:05,562 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:51:05,562 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:51:05,562 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:51:05,563 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:51:05,563 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:05,563 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:51:05,563 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:51:05,563 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 10:51:05,922 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:51:05,941 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:51:05,945 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:51:05,947 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:51:05,947 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:51:05,948 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 10:51:06,034 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c38d896/b362974b87214aa2ad4e81f7c74160c8/FLAGc5b26a01c [2020-07-20 10:51:06,565 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:51:06,568 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 10:51:06,578 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c38d896/b362974b87214aa2ad4e81f7c74160c8/FLAGc5b26a01c [2020-07-20 10:51:06,898 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/50c38d896/b362974b87214aa2ad4e81f7c74160c8 [2020-07-20 10:51:06,911 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 10:51:06,914 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 10:51:06,916 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 10:51:06,916 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 10:51:06,920 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 10:51:06,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:51:06" (1/1) ... [2020-07-20 10:51:06,924 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@478c2760 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:06, skipping insertion in model container [2020-07-20 10:51:06,925 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:51:06" (1/1) ... [2020-07-20 10:51:06,935 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 10:51:06,953 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 10:51:07,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:51:07,126 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 10:51:07,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:51:07,152 INFO L208 MainTranslator]: Completed translation [2020-07-20 10:51:07,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07 WrapperNode [2020-07-20 10:51:07,153 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 10:51:07,154 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 10:51:07,154 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 10:51:07,154 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 10:51:07,164 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,164 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,170 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,171 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,174 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,177 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,177 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... [2020-07-20 10:51:07,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 10:51:07,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 10:51:07,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 10:51:07,180 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 10:51:07,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:51:07,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 10:51:07,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 10:51:07,327 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 10:51:07,327 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 10:51:07,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 10:51:07,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 10:51:07,327 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 10:51:07,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 10:51:07,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 10:51:07,328 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 10:51:07,508 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 10:51:07,508 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 10:51:07,513 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:51:07 BoogieIcfgContainer [2020-07-20 10:51:07,514 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 10:51:07,515 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 10:51:07,515 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 10:51:07,519 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 10:51:07,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:51:06" (1/3) ... [2020-07-20 10:51:07,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25f5bcc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:51:07, skipping insertion in model container [2020-07-20 10:51:07,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:51:07" (2/3) ... [2020-07-20 10:51:07,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25f5bcc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:51:07, skipping insertion in model container [2020-07-20 10:51:07,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:51:07" (3/3) ... [2020-07-20 10:51:07,524 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_10-2.c [2020-07-20 10:51:07,536 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 10:51:07,545 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 10:51:07,561 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 10:51:07,596 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 10:51:07,597 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 10:51:07,597 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 10:51:07,597 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 10:51:07,600 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 10:51:07,600 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 10:51:07,600 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 10:51:07,601 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 10:51:07,629 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 10:51:07,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 10:51:07,638 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:07,639 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:07,640 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:07,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:07,649 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 10:51:07,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:07,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577346492] [2020-07-20 10:51:07,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:07,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:07,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:51:07,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:07,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:51:07,869 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:51:07,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577346492] [2020-07-20 10:51:07,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:51:07,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:51:07,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215438158] [2020-07-20 10:51:07,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:51:07,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:07,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:51:07,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:51:07,899 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 10:51:08,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:08,030 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 10:51:08,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:51:08,033 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 10:51:08,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:08,046 INFO L225 Difference]: With dead ends: 35 [2020-07-20 10:51:08,047 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 10:51:08,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:51:08,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 10:51:08,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 10:51:08,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 10:51:08,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 10:51:08,119 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 10:51:08,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:08,125 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 10:51:08,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:51:08,125 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 10:51:08,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 10:51:08,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:08,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:08,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:08,336 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:08,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:08,337 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 10:51:08,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:08,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108839153] [2020-07-20 10:51:08,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:08,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:08,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 10:51:08,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:08,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:51:08,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:51:08,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108839153] [2020-07-20 10:51:08,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:51:08,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 10:51:08,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326240934] [2020-07-20 10:51:08,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 10:51:08,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:08,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 10:51:08,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 10:51:08,410 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 10:51:08,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:08,488 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 10:51:08,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 10:51:08,491 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 10:51:08,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:08,493 INFO L225 Difference]: With dead ends: 27 [2020-07-20 10:51:08,494 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 10:51:08,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:51:08,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 10:51:08,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 10:51:08,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 10:51:08,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 10:51:08,505 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 10:51:08,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:08,505 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 10:51:08,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 10:51:08,506 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 10:51:08,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 10:51:08,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:08,508 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:08,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:08,715 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:08,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:08,716 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 10:51:08,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:08,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413155363] [2020-07-20 10:51:08,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:08,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 10:51:08,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:08,806 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 10:51:08,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:09,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 10:51:09,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413155363] [2020-07-20 10:51:09,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:09,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 10:51:09,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050522740] [2020-07-20 10:51:09,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:51:09,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:09,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:51:09,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:51:09,059 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 10:51:09,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:09,196 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 10:51:09,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:51:09,198 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 10:51:09,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:09,200 INFO L225 Difference]: With dead ends: 32 [2020-07-20 10:51:09,200 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 10:51:09,201 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 [2020-07-20 10:51:09,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 10:51:09,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 10:51:09,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 10:51:09,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 10:51:09,212 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 10:51:09,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:09,213 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 10:51:09,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:51:09,213 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 10:51:09,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 10:51:09,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:09,216 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:09,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:09,431 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:09,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:09,432 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 10:51:09,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:09,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696049429] [2020-07-20 10:51:09,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:09,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:09,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 10:51:09,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:09,524 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 10:51:09,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:09,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:09,753 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 10:51:09,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696049429] [2020-07-20 10:51:09,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:09,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 10:51:09,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719862726] [2020-07-20 10:51:09,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 10:51:09,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:09,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 10:51:09,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 10:51:09,757 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 10:51:09,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:09,851 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 10:51:09,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:51:09,851 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 10:51:09,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:09,854 INFO L225 Difference]: With dead ends: 37 [2020-07-20 10:51:09,855 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 10:51:09,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 10:51:09,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 10:51:09,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 10:51:09,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 10:51:09,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 10:51:09,864 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 10:51:09,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:09,865 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 10:51:09,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 10:51:09,865 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 10:51:09,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 10:51:09,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:09,867 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:10,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:10,081 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:10,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:10,083 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 10:51:10,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:10,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2013906743] [2020-07-20 10:51:10,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:10,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:10,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 10:51:10,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:10,168 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 10:51:10,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:10,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:10,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:10,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:10,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 10:51:10,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2013906743] [2020-07-20 10:51:10,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:10,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 10:51:10,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499061389] [2020-07-20 10:51:10,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 10:51:10,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:10,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 10:51:10,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 10:51:10,551 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 10:51:10,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:10,748 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 10:51:10,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 10:51:10,748 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 10:51:10,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:10,751 INFO L225 Difference]: With dead ends: 42 [2020-07-20 10:51:10,751 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 10:51:10,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 10:51:10,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 10:51:10,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 10:51:10,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:51:10,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 10:51:10,763 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 10:51:10,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:10,763 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 10:51:10,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 10:51:10,764 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 10:51:10,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 10:51:10,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:10,766 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:10,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:10,974 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:10,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:10,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 10:51:10,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:10,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730539748] [2020-07-20 10:51:10,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:11,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:11,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 10:51:11,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:11,071 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 10:51:11,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:11,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:11,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:11,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:11,475 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 10:51:11,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730539748] [2020-07-20 10:51:11,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:11,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 10:51:11,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641509449] [2020-07-20 10:51:11,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 10:51:11,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:11,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 10:51:11,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 10:51:11,479 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 10:51:11,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:11,656 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 10:51:11,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 10:51:11,656 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 10:51:11,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:11,661 INFO L225 Difference]: With dead ends: 47 [2020-07-20 10:51:11,662 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 10:51:11,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 10:51:11,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 10:51:11,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 10:51:11,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:51:11,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 10:51:11,694 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 10:51:11,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:11,694 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 10:51:11,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 10:51:11,694 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 10:51:11,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 10:51:11,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:11,704 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:11,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:11,923 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:11,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:11,923 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 10:51:11,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:11,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006496115] [2020-07-20 10:51:11,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:11,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:11,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 10:51:11,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:12,051 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 10:51:12,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:12,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:12,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:12,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:12,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:12,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:12,807 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 10:51:12,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006496115] [2020-07-20 10:51:12,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:12,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 10:51:12,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630407555] [2020-07-20 10:51:12,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 10:51:12,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:12,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 10:51:12,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 10:51:12,813 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 10:51:13,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:13,023 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 10:51:13,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 10:51:13,025 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 10:51:13,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:13,030 INFO L225 Difference]: With dead ends: 52 [2020-07-20 10:51:13,030 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 10:51:13,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 10:51:13,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 10:51:13,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 10:51:13,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 10:51:13,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 10:51:13,070 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 10:51:13,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:13,072 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 10:51:13,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 10:51:13,072 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 10:51:13,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 10:51:13,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:13,081 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:13,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:13,297 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:13,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:13,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 10:51:13,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:13,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726617785] [2020-07-20 10:51:13,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:13,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 10:51:13,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:13,449 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 10:51:13,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:13,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:14,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:14,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:14,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 10:51:14,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726617785] [2020-07-20 10:51:14,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:14,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 10:51:14,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423305340] [2020-07-20 10:51:14,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 10:51:14,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:14,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 10:51:14,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 10:51:14,182 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 10:51:14,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:14,373 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 10:51:14,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 10:51:14,377 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 10:51:14,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:14,380 INFO L225 Difference]: With dead ends: 57 [2020-07-20 10:51:14,380 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 10:51:14,381 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 [2020-07-20 10:51:14,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 10:51:14,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 10:51:14,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 10:51:14,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 10:51:14,396 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 10:51:14,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:14,397 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 10:51:14,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 10:51:14,397 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 10:51:14,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 10:51:14,400 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:14,400 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:14,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:14,616 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:14,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:14,617 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 10:51:14,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:14,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431904983] [2020-07-20 10:51:14,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:14,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:14,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 10:51:14,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:14,806 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 10:51:14,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:15,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:15,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:15,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:15,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:15,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:15,925 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 10:51:15,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431904983] [2020-07-20 10:51:15,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:15,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 10:51:15,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64727805] [2020-07-20 10:51:15,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:51:15,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:15,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:51:15,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 10:51:15,930 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 10:51:16,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:16,268 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 10:51:16,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:51:16,269 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 10:51:16,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:16,271 INFO L225 Difference]: With dead ends: 62 [2020-07-20 10:51:16,272 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 10:51:16,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 10:51:16,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 10:51:16,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 10:51:16,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 10:51:16,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 10:51:16,292 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 10:51:16,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:16,292 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 10:51:16,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:51:16,293 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 10:51:16,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 10:51:16,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:16,297 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:16,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:16,507 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:16,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:16,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 10:51:16,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:16,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881407623] [2020-07-20 10:51:16,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:16,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:16,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 10:51:16,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:16,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 10:51:16,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:17,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:17,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 10:51:17,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881407623] [2020-07-20 10:51:17,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:17,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 10:51:17,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499083917] [2020-07-20 10:51:17,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:51:17,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:17,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:51:17,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 10:51:17,972 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 10:51:18,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:18,135 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 10:51:18,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 10:51:18,136 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 10:51:18,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:18,139 INFO L225 Difference]: With dead ends: 67 [2020-07-20 10:51:18,139 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 10:51:18,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 10:51:18,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 10:51:18,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 10:51:18,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 10:51:18,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 10:51:18,153 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 10:51:18,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:18,153 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 10:51:18,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:51:18,154 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 10:51:18,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 10:51:18,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:18,158 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:18,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:18,373 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:18,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:18,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 10:51:18,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:18,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501490284] [2020-07-20 10:51:18,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:18,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 10:51:18,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:18,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 10:51:18,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:19,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:20,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 10:51:20,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501490284] [2020-07-20 10:51:20,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:20,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 10:51:20,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845710292] [2020-07-20 10:51:20,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 10:51:20,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:20,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 10:51:20,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 10:51:20,821 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 10:51:21,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:21,074 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 10:51:21,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 10:51:21,075 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 10:51:21,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:21,078 INFO L225 Difference]: With dead ends: 72 [2020-07-20 10:51:21,078 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 10:51:21,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 10:51:21,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 10:51:21,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 10:51:21,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 10:51:21,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 10:51:21,111 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 10:51:21,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:21,114 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 10:51:21,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 10:51:21,114 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 10:51:21,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 10:51:21,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:21,123 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:21,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:21,339 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:21,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:21,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 10:51:21,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:21,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660462776] [2020-07-20 10:51:21,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:21,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:21,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 10:51:21,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:21,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 10:51:21,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:23,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:23,854 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 10:51:23,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660462776] [2020-07-20 10:51:23,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:23,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 10:51:23,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989546899] [2020-07-20 10:51:23,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 10:51:23,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:23,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 10:51:23,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 10:51:23,856 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 10:51:24,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:24,111 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 10:51:24,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 10:51:24,112 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 10:51:24,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:24,115 INFO L225 Difference]: With dead ends: 77 [2020-07-20 10:51:24,116 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 10:51:24,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 10:51:24,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 10:51:24,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 10:51:24,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 10:51:24,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 10:51:24,128 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 10:51:24,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:24,129 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 10:51:24,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 10:51:24,130 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 10:51:24,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 10:51:24,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:24,140 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:24,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:24,356 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:24,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:24,356 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 10:51:24,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:24,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005010048] [2020-07-20 10:51:24,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:24,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:24,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 10:51:24,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:24,871 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 10:51:24,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:27,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:27,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:28,803 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 10:51:28,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005010048] [2020-07-20 10:51:28,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:28,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 10:51:28,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441515438] [2020-07-20 10:51:28,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 10:51:28,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:28,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 10:51:28,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 10:51:28,807 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 10:51:29,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:29,319 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 10:51:29,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 10:51:29,319 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 10:51:29,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:29,324 INFO L225 Difference]: With dead ends: 82 [2020-07-20 10:51:29,324 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 10:51:29,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 10:51:29,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 10:51:29,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 10:51:29,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 10:51:29,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 10:51:29,338 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 10:51:29,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:29,339 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 10:51:29,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 10:51:29,340 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 10:51:29,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 10:51:29,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:29,343 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:29,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:29,558 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:29,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:29,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 10:51:29,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:29,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747852480] [2020-07-20 10:51:29,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:29,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:29,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 10:51:29,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:30,009 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 10:51:30,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:32,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:32,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:32,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:33,612 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 10:51:33,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747852480] [2020-07-20 10:51:33,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:33,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 10:51:33,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810819195] [2020-07-20 10:51:33,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 10:51:33,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:33,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 10:51:33,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 10:51:33,616 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 10:51:33,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:33,911 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 10:51:33,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 10:51:33,912 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 10:51:33,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:33,915 INFO L225 Difference]: With dead ends: 87 [2020-07-20 10:51:33,916 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 10:51:33,918 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 [2020-07-20 10:51:33,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 10:51:33,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 10:51:33,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 10:51:33,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 10:51:33,949 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 10:51:33,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:33,951 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 10:51:33,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 10:51:33,951 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 10:51:33,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 10:51:33,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:33,967 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:34,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:34,183 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:34,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:34,184 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 10:51:34,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:34,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966139118] [2020-07-20 10:51:34,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:34,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:34,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 10:51:34,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:35,334 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 10:51:35,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:39,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:39,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:41,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:42,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:43,277 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 10:51:43,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966139118] [2020-07-20 10:51:43,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:43,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 10:51:43,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80966759] [2020-07-20 10:51:43,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 10:51:43,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:43,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 10:51:43,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 10:51:43,281 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 10:51:44,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:44,056 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 10:51:44,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:51:44,057 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 10:51:44,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:44,063 INFO L225 Difference]: With dead ends: 92 [2020-07-20 10:51:44,064 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 10:51:44,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 10:51:44,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 10:51:44,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 10:51:44,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 10:51:44,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 10:51:44,081 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 10:51:44,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:44,083 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 10:51:44,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 10:51:44,083 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 10:51:44,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 821 [2020-07-20 10:51:44,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:44,092 INFO L422 BasicCegarLoop]: trace histogram [119, 119, 99, 59, 59, 59, 59, 59, 59, 59, 40, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:44,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:44,307 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:44,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:44,308 INFO L82 PathProgramCache]: Analyzing trace with hash 256338188, now seen corresponding path program 7 times [2020-07-20 10:51:44,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:44,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128269163] [2020-07-20 10:51:44,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:44,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:44,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 10:51:44,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:45,108 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4385 refuted. 0 times theorem prover too weak. 34812 trivial. 0 not checked. [2020-07-20 10:51:45,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:48,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:48,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:49,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:50,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:51,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:51,668 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4462 refuted. 0 times theorem prover too weak. 34735 trivial. 0 not checked. [2020-07-20 10:51:51,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128269163] [2020-07-20 10:51:51,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:51,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 10:51:51,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842287322] [2020-07-20 10:51:51,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 10:51:51,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:51,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 10:51:51,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 10:51:51,671 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 10:51:52,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:52,354 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 10:51:52,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:51:52,355 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 820 [2020-07-20 10:51:52,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:52,365 INFO L225 Difference]: With dead ends: 97 [2020-07-20 10:51:52,365 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 10:51:52,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1604 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 10:51:52,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 10:51:52,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 10:51:52,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 10:51:52,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 10:51:52,385 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 820 [2020-07-20 10:51:52,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:52,387 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 10:51:52,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 10:51:52,387 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 10:51:52,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1405 [2020-07-20 10:51:52,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:52,413 INFO L422 BasicCegarLoop]: trace histogram [215, 215, 108, 107, 107, 107, 107, 107, 107, 107, 107, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:52,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:52,627 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:52,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:52,627 INFO L82 PathProgramCache]: Analyzing trace with hash -60458800, now seen corresponding path program 8 times [2020-07-20 10:51:52,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:52,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634348320] [2020-07-20 10:51:52,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:53,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:53,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:51:53,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:54,152 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8355 refuted. 0 times theorem prover too weak. 110697 trivial. 0 not checked. [2020-07-20 10:51:54,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:59,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:01,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:03,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:03,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:03,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:04,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:05,200 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8447 refuted. 0 times theorem prover too weak. 110605 trivial. 0 not checked. [2020-07-20 10:52:05,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634348320] [2020-07-20 10:52:05,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:52:05,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 10:52:05,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744269767] [2020-07-20 10:52:05,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 10:52:05,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:52:05,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 10:52:05,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 10:52:05,204 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 10:52:05,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:52:05,957 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 10:52:05,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:52:05,959 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1404 [2020-07-20 10:52:05,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:52:05,964 INFO L225 Difference]: With dead ends: 102 [2020-07-20 10:52:05,964 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 10:52:05,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2817 GetRequests, 2769 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 10:52:05,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 10:52:05,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 10:52:05,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 10:52:05,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 10:52:05,980 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1404 [2020-07-20 10:52:05,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:52:05,983 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 10:52:05,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 10:52:05,984 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 10:52:06,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1521 [2020-07-20 10:52:06,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:52:06,005 INFO L422 BasicCegarLoop]: trace histogram [223, 223, 175, 111, 111, 111, 111, 111, 111, 111, 64, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:52:06,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:06,221 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:52:06,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:52:06,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1003822174, now seen corresponding path program 8 times [2020-07-20 10:52:06,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:52:06,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151490084] [2020-07-20 10:52:06,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:06,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:52:06,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 3377 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:52:06,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:52:07,847 INFO L134 CoverageAnalysis]: Checked inductivity of 138657 backedges. 1357 proven. 9367 refuted. 0 times theorem prover too weak. 127933 trivial. 0 not checked. [2020-07-20 10:52:07,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:52:13,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:15,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:15,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:17,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:17,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:17,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:18,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:18,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:18,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:18,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:18,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:19,634 INFO L134 CoverageAnalysis]: Checked inductivity of 138657 backedges. 1357 proven. 9467 refuted. 0 times theorem prover too weak. 127833 trivial. 0 not checked. [2020-07-20 10:52:19,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151490084] [2020-07-20 10:52:19,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:52:19,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 10:52:19,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489368983] [2020-07-20 10:52:19,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:52:19,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:52:19,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:52:19,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:52:19,638 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 22 states. [2020-07-20 10:52:20,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:52:20,106 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 10:52:20,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:52:20,107 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1520 [2020-07-20 10:52:20,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:52:20,113 INFO L225 Difference]: With dead ends: 107 [2020-07-20 10:52:20,113 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 10:52:20,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3048 GetRequests, 3000 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 10:52:20,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 10:52:20,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 10:52:20,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 10:52:20,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 10:52:20,132 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1520 [2020-07-20 10:52:20,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:52:20,133 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 10:52:20,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:52:20,133 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 10:52:20,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2523 [2020-07-20 10:52:20,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:52:20,182 INFO L422 BasicCegarLoop]: trace histogram [387, 387, 194, 193, 193, 193, 193, 193, 193, 193, 193, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:52:20,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:20,393 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:52:20,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:52:20,395 INFO L82 PathProgramCache]: Analyzing trace with hash -1336408704, now seen corresponding path program 9 times [2020-07-20 10:52:20,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:52:20,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89059484] [2020-07-20 10:52:20,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:21,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:52:21,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 5627 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:52:21,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:52:24,133 INFO L134 CoverageAnalysis]: Checked inductivity of 391404 backedges. 2389 proven. 17399 refuted. 0 times theorem prover too weak. 371616 trivial. 0 not checked. [2020-07-20 10:52:24,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:52:35,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:38,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:40,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:41,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:41,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:42,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:42,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:43,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:43,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:43,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:43,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:43,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:52:46,057 INFO L134 CoverageAnalysis]: Checked inductivity of 391404 backedges. 2389 proven. 17516 refuted. 0 times theorem prover too weak. 371499 trivial. 0 not checked. [2020-07-20 10:52:46,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89059484] [2020-07-20 10:52:46,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:52:46,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 10:52:46,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319314773] [2020-07-20 10:52:46,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:52:46,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:52:46,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:52:46,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:52:46,061 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 24 states. [2020-07-20 10:52:47,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:52:47,141 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 10:52:47,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:52:47,142 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 2522 [2020-07-20 10:52:47,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:52:47,149 INFO L225 Difference]: With dead ends: 112 [2020-07-20 10:52:47,149 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 10:52:47,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5054 GetRequests, 5001 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 10:52:47,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 10:52:47,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 10:52:47,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 10:52:47,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 10:52:47,168 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2522 [2020-07-20 10:52:47,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:52:47,170 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 10:52:47,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:52:47,171 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 10:52:47,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3664 [2020-07-20 10:52:47,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:52:47,291 INFO L422 BasicCegarLoop]: trace histogram [539, 539, 422, 269, 269, 269, 269, 269, 269, 269, 153, 117, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:52:47,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:47,506 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:52:47,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:52:47,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2013600424, now seen corresponding path program 9 times [2020-07-20 10:52:47,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:52:47,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801238057] [2020-07-20 10:52:47,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:48,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:52:48,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 8137 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:52:48,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:52:54,496 INFO L134 CoverageAnalysis]: Checked inductivity of 812979 backedges. 3656 proven. 26937 refuted. 0 times theorem prover too weak. 782386 trivial. 0 not checked. [2020-07-20 10:52:54,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:10,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:14,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:14,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:18,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:19,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:20,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:21,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:53:26,471 INFO L134 CoverageAnalysis]: Checked inductivity of 812979 backedges. 3668 proven. 27042 refuted. 0 times theorem prover too weak. 782269 trivial. 0 not checked. [2020-07-20 10:53:26,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801238057] [2020-07-20 10:53:26,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:26,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 10:53:26,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459928045] [2020-07-20 10:53:26,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:53:26,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:26,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:53:26,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:53:26,479 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 24 states. [2020-07-20 10:53:27,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:27,232 INFO L93 Difference]: Finished difference Result 298 states and 3289 transitions. [2020-07-20 10:53:27,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:53:27,233 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 3663 [2020-07-20 10:53:27,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:27,241 INFO L225 Difference]: With dead ends: 298 [2020-07-20 10:53:27,242 INFO L226 Difference]: Without dead ends: 74 [2020-07-20 10:53:27,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7335 GetRequests, 7282 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 10:53:27,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-20 10:53:27,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2020-07-20 10:53:27,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-20 10:53:27,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 100 transitions. [2020-07-20 10:53:27,287 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 100 transitions. Word has length 3663 [2020-07-20 10:53:27,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:27,288 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 100 transitions. [2020-07-20 10:53:27,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:53:27,288 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 100 transitions. [2020-07-20 10:53:27,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-20 10:53:27,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:27,305 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 143, 88, 88, 88, 88, 88, 88, 88, 55, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:53:27,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:27,520 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:27,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:27,520 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 10 times [2020-07-20 10:53:27,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:27,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757518713] [2020-07-20 10:53:27,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:28,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:53:28,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 2692 conjuncts, 711 conjunts are in the unsatisfiable core [2020-07-20 10:53:28,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:30,108 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 10:53:30,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:58,021 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 10:53:58,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757518713] [2020-07-20 10:53:58,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:53:58,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 40 [2020-07-20 10:53:58,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002183973] [2020-07-20 10:53:58,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 10:53:58,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:53:58,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 10:53:58,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1465, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 10:53:58,024 INFO L87 Difference]: Start difference. First operand 74 states and 100 transitions. Second operand 40 states. [2020-07-20 10:53:59,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:53:59,480 INFO L93 Difference]: Finished difference Result 156 states and 251 transitions. [2020-07-20 10:53:59,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 10:53:59,481 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1212 [2020-07-20 10:53:59,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:53:59,494 INFO L225 Difference]: With dead ends: 156 [2020-07-20 10:53:59,494 INFO L226 Difference]: Without dead ends: 149 [2020-07-20 10:53:59,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2425 GetRequests, 2339 SyntacticMatches, 46 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=103, Invalid=1619, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 10:53:59,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-07-20 10:53:59,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 121. [2020-07-20 10:53:59,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 10:53:59,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 199 transitions. [2020-07-20 10:53:59,540 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 199 transitions. Word has length 1212 [2020-07-20 10:53:59,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:53:59,543 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 199 transitions. [2020-07-20 10:53:59,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 10:53:59,543 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 199 transitions. [2020-07-20 10:53:59,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1583 [2020-07-20 10:53:59,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:53:59,590 INFO L422 BasicCegarLoop]: trace histogram [233, 233, 177, 116, 116, 116, 116, 116, 116, 116, 61, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:53:59,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:53:59,805 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:53:59,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:53:59,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1484172121, now seen corresponding path program 11 times [2020-07-20 10:53:59,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:53:59,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99606052] [2020-07-20 10:53:59,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:00,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:00,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 3516 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:54:00,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:02,025 INFO L134 CoverageAnalysis]: Checked inductivity of 150368 backedges. 2088 proven. 10755 refuted. 0 times theorem prover too weak. 137525 trivial. 0 not checked. [2020-07-20 10:54:02,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:10,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:12,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:14,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:16,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:16,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:16,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:17,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:17,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:17,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:17,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:17,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:18,888 INFO L134 CoverageAnalysis]: Checked inductivity of 150368 backedges. 2098 proven. 10862 refuted. 0 times theorem prover too weak. 137408 trivial. 0 not checked. [2020-07-20 10:54:18,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99606052] [2020-07-20 10:54:18,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:18,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 10:54:18,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331668007] [2020-07-20 10:54:18,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:54:18,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:18,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:54:18,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:54:18,891 INFO L87 Difference]: Start difference. First operand 121 states and 199 transitions. Second operand 24 states. [2020-07-20 10:54:19,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:19,609 INFO L93 Difference]: Finished difference Result 197 states and 337 transitions. [2020-07-20 10:54:19,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:54:19,614 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1582 [2020-07-20 10:54:19,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:19,619 INFO L225 Difference]: With dead ends: 197 [2020-07-20 10:54:19,620 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 10:54:19,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3173 GetRequests, 3120 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 10:54:19,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 10:54:19,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 131. [2020-07-20 10:54:19,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-07-20 10:54:19,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 215 transitions. [2020-07-20 10:54:19,655 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 215 transitions. Word has length 1582 [2020-07-20 10:54:19,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:19,656 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 215 transitions. [2020-07-20 10:54:19,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:54:19,656 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 215 transitions. [2020-07-20 10:54:19,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1417 [2020-07-20 10:54:19,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:19,689 INFO L422 BasicCegarLoop]: trace histogram [209, 209, 155, 104, 104, 104, 104, 104, 104, 104, 54, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:54:19,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:19,905 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:19,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:19,906 INFO L82 PathProgramCache]: Analyzing trace with hash 540521299, now seen corresponding path program 12 times [2020-07-20 10:54:19,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:19,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355698907] [2020-07-20 10:54:19,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:20,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:20,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 3148 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 10:54:20,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:22,022 INFO L134 CoverageAnalysis]: Checked inductivity of 120303 backedges. 1999 proven. 9048 refuted. 0 times theorem prover too weak. 109256 trivial. 0 not checked. [2020-07-20 10:54:22,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:30,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:30,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:32,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:32,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:34,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:34,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:35,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:35,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:36,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:37,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:38,564 INFO L134 CoverageAnalysis]: Checked inductivity of 120303 backedges. 2007 proven. 9157 refuted. 0 times theorem prover too weak. 109139 trivial. 0 not checked. [2020-07-20 10:54:38,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355698907] [2020-07-20 10:54:38,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:38,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 10:54:38,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536977738] [2020-07-20 10:54:38,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:54:38,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:38,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:54:38,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:54:38,568 INFO L87 Difference]: Start difference. First operand 131 states and 215 transitions. Second operand 24 states. [2020-07-20 10:54:39,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:39,074 INFO L93 Difference]: Finished difference Result 215 states and 364 transitions. [2020-07-20 10:54:39,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:54:39,076 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1416 [2020-07-20 10:54:39,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:39,081 INFO L225 Difference]: With dead ends: 215 [2020-07-20 10:54:39,082 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 10:54:39,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2841 GetRequests, 2788 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 10:54:39,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 10:54:39,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 141. [2020-07-20 10:54:39,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-07-20 10:54:39,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 235 transitions. [2020-07-20 10:54:39,119 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 235 transitions. Word has length 1416 [2020-07-20 10:54:39,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:39,120 INFO L479 AbstractCegarLoop]: Abstraction has 141 states and 235 transitions. [2020-07-20 10:54:39,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:54:39,120 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 235 transitions. [2020-07-20 10:54:39,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1261 [2020-07-20 10:54:39,148 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:39,148 INFO L422 BasicCegarLoop]: trace histogram [185, 185, 143, 92, 92, 92, 92, 92, 92, 92, 51, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:54:39,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:39,364 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:39,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:39,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1711727949, now seen corresponding path program 13 times [2020-07-20 10:54:39,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:39,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8042624] [2020-07-20 10:54:39,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:40,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:40,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 2800 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:54:40,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:41,291 INFO L134 CoverageAnalysis]: Checked inductivity of 94977 backedges. 1688 proven. 6480 refuted. 0 times theorem prover too weak. 86809 trivial. 0 not checked. [2020-07-20 10:54:41,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:54:47,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:47,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:50,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:50,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:51,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:51,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:52,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:52,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:52,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:52,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:53,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:53,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:53,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:53,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:54:54,075 INFO L134 CoverageAnalysis]: Checked inductivity of 94977 backedges. 1699 proven. 6541 refuted. 0 times theorem prover too weak. 86737 trivial. 0 not checked. [2020-07-20 10:54:54,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8042624] [2020-07-20 10:54:54,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:54:54,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 10:54:54,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986383455] [2020-07-20 10:54:54,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:54:54,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:54,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:54:54,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:54:54,078 INFO L87 Difference]: Start difference. First operand 141 states and 235 transitions. Second operand 22 states. [2020-07-20 10:54:54,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:54:54,529 INFO L93 Difference]: Finished difference Result 208 states and 347 transitions. [2020-07-20 10:54:54,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:54:54,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1260 [2020-07-20 10:54:54,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:54:54,537 INFO L225 Difference]: With dead ends: 208 [2020-07-20 10:54:54,538 INFO L226 Difference]: Without dead ends: 181 [2020-07-20 10:54:54,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2527 GetRequests, 2482 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 10:54:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2020-07-20 10:54:54,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 144. [2020-07-20 10:54:54,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 10:54:54,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 240 transitions. [2020-07-20 10:54:54,570 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 240 transitions. Word has length 1260 [2020-07-20 10:54:54,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:54:54,570 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 240 transitions. [2020-07-20 10:54:54,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:54:54,571 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 240 transitions. [2020-07-20 10:54:54,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1381 [2020-07-20 10:54:54,596 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:54:54,597 INFO L422 BasicCegarLoop]: trace histogram [205, 205, 143, 102, 102, 102, 102, 102, 102, 102, 62, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:54:54,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:54,811 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:54:54,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:54:54,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1738933525, now seen corresponding path program 14 times [2020-07-20 10:54:54,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:54:54,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860326030] [2020-07-20 10:54:54,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:54:55,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:54:55,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 3070 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:54:55,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:54:57,646 INFO L134 CoverageAnalysis]: Checked inductivity of 114397 backedges. 1713 proven. 8329 refuted. 0 times theorem prover too weak. 104355 trivial. 0 not checked. [2020-07-20 10:54:57,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:55:00,242 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 61 [2020-07-20 10:55:04,547 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 55 [2020-07-20 10:55:04,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:07,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:09,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:10,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:11,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:12,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:12,944 INFO L134 CoverageAnalysis]: Checked inductivity of 114397 backedges. 1717 proven. 8417 refuted. 0 times theorem prover too weak. 104263 trivial. 0 not checked. [2020-07-20 10:55:12,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860326030] [2020-07-20 10:55:12,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:55:12,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:55:12,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83245017] [2020-07-20 10:55:12,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:55:12,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:12,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:55:12,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:55:12,947 INFO L87 Difference]: Start difference. First operand 144 states and 240 transitions. Second operand 24 states. [2020-07-20 10:55:13,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:13,757 INFO L93 Difference]: Finished difference Result 348 states and 679 transitions. [2020-07-20 10:55:13,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:55:13,759 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1380 [2020-07-20 10:55:13,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:13,768 INFO L225 Difference]: With dead ends: 348 [2020-07-20 10:55:13,769 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 10:55:13,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2768 GetRequests, 2718 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:55:13,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 10:55:13,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2020-07-20 10:55:13,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 10:55:13,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 226 transitions. [2020-07-20 10:55:13,836 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 226 transitions. Word has length 1380 [2020-07-20 10:55:13,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:13,838 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 226 transitions. [2020-07-20 10:55:13,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:55:13,838 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 226 transitions. [2020-07-20 10:55:13,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1273 [2020-07-20 10:55:13,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:13,871 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 143, 93, 93, 93, 93, 93, 93, 93, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:14,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:14,085 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:14,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:14,086 INFO L82 PathProgramCache]: Analyzing trace with hash -1475726784, now seen corresponding path program 15 times [2020-07-20 10:55:14,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:14,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655088646] [2020-07-20 10:55:14,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:14,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:15,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 2827 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:55:15,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:15,848 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 1619 proven. 7613 refuted. 0 times theorem prover too weak. 87597 trivial. 0 not checked. [2020-07-20 10:55:15,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:55:23,667 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 55 [2020-07-20 10:55:23,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:23,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:26,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:28,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:29,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:30,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:31,738 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 1621 proven. 7703 refuted. 0 times theorem prover too weak. 87505 trivial. 0 not checked. [2020-07-20 10:55:31,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655088646] [2020-07-20 10:55:31,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:55:31,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:55:31,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060560574] [2020-07-20 10:55:31,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:55:31,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:31,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:55:31,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:55:31,743 INFO L87 Difference]: Start difference. First operand 144 states and 226 transitions. Second operand 24 states. [2020-07-20 10:55:32,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:32,291 INFO L93 Difference]: Finished difference Result 185 states and 288 transitions. [2020-07-20 10:55:32,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:55:32,293 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1272 [2020-07-20 10:55:32,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:32,298 INFO L225 Difference]: With dead ends: 185 [2020-07-20 10:55:32,299 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 10:55:32,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2552 GetRequests, 2502 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:55:32,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 10:55:32,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 141. [2020-07-20 10:55:32,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-07-20 10:55:32,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 219 transitions. [2020-07-20 10:55:32,327 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 219 transitions. Word has length 1272 [2020-07-20 10:55:32,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:32,327 INFO L479 AbstractCegarLoop]: Abstraction has 141 states and 219 transitions. [2020-07-20 10:55:32,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:55:32,328 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 219 transitions. [2020-07-20 10:55:32,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 10:55:32,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:32,351 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:32,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:32,564 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:32,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:32,565 INFO L82 PathProgramCache]: Analyzing trace with hash -792326142, now seen corresponding path program 16 times [2020-07-20 10:55:32,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:32,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053787388] [2020-07-20 10:55:32,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:33,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:33,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 2773 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:55:33,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:34,357 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1735 proven. 7317 refuted. 0 times theorem prover too weak. 84093 trivial. 0 not checked. [2020-07-20 10:55:34,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:55:37,358 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-07-20 10:55:41,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:45,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:46,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:46,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:48,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:48,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:48,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:48,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:49,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:49,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:49,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:49,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:55:50,902 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1735 proven. 7409 refuted. 0 times theorem prover too weak. 84001 trivial. 0 not checked. [2020-07-20 10:55:50,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053787388] [2020-07-20 10:55:50,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:55:50,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:55:50,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813287467] [2020-07-20 10:55:50,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:55:50,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:55:50,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:55:50,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:55:50,905 INFO L87 Difference]: Start difference. First operand 141 states and 219 transitions. Second operand 24 states. [2020-07-20 10:55:51,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:55:51,746 INFO L93 Difference]: Finished difference Result 195 states and 301 transitions. [2020-07-20 10:55:51,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:55:51,749 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1248 [2020-07-20 10:55:51,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:55:51,754 INFO L225 Difference]: With dead ends: 195 [2020-07-20 10:55:51,755 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 10:55:51,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2504 GetRequests, 2454 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:55:51,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 10:55:51,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 126. [2020-07-20 10:55:51,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-20 10:55:51,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 190 transitions. [2020-07-20 10:55:51,798 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 190 transitions. Word has length 1248 [2020-07-20 10:55:51,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:55:51,799 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 190 transitions. [2020-07-20 10:55:51,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:55:51,800 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 190 transitions. [2020-07-20 10:55:51,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1215 [2020-07-20 10:55:51,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:55:51,823 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 145, 88, 88, 88, 88, 88, 88, 88, 57, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:55:52,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:52,039 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:55:52,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:55:52,040 INFO L82 PathProgramCache]: Analyzing trace with hash -416309025, now seen corresponding path program 17 times [2020-07-20 10:55:52,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:55:52,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104115268] [2020-07-20 10:55:52,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:55:53,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:55:53,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 2696 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:55:53,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:55:53,833 INFO L134 CoverageAnalysis]: Checked inductivity of 88056 backedges. 1942 proven. 6540 refuted. 0 times theorem prover too weak. 79574 trivial. 0 not checked. [2020-07-20 10:55:53,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:01,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:01,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:04,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:04,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:05,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:05,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:06,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:06,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:06,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:07,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:08,606 INFO L134 CoverageAnalysis]: Checked inductivity of 88056 backedges. 1960 proven. 6616 refuted. 0 times theorem prover too weak. 79480 trivial. 0 not checked. [2020-07-20 10:56:08,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104115268] [2020-07-20 10:56:08,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:56:08,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 10:56:08,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15910104] [2020-07-20 10:56:08,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:56:08,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:56:08,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:56:08,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:56:08,609 INFO L87 Difference]: Start difference. First operand 126 states and 190 transitions. Second operand 22 states. [2020-07-20 10:56:09,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:56:09,219 INFO L93 Difference]: Finished difference Result 192 states and 298 transitions. [2020-07-20 10:56:09,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:56:09,220 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1214 [2020-07-20 10:56:09,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:56:09,230 INFO L225 Difference]: With dead ends: 192 [2020-07-20 10:56:09,230 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 10:56:09,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2436 GetRequests, 2388 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 10:56:09,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 10:56:09,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 146. [2020-07-20 10:56:09,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 10:56:09,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 227 transitions. [2020-07-20 10:56:09,260 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 227 transitions. Word has length 1214 [2020-07-20 10:56:09,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:56:09,261 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 227 transitions. [2020-07-20 10:56:09,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:56:09,261 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 227 transitions. [2020-07-20 10:56:09,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1250 [2020-07-20 10:56:09,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:56:09,283 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 144, 91, 91, 91, 91, 91, 91, 91, 53, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:56:09,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:09,498 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:56:09,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:56:09,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1657939194, now seen corresponding path program 18 times [2020-07-20 10:56:09,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:56:09,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516657736] [2020-07-20 10:56:09,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:10,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:56:10,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 2775 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:56:10,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:56:11,223 INFO L134 CoverageAnalysis]: Checked inductivity of 93288 backedges. 3827 proven. 4904 refuted. 0 times theorem prover too weak. 84557 trivial. 0 not checked. [2020-07-20 10:56:11,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:19,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:20,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:20,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:22,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:22,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:23,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:23,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:23,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:23,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:23,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:24,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:24,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:24,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:24,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:27,625 INFO L134 CoverageAnalysis]: Checked inductivity of 93288 backedges. 3841 proven. 4984 refuted. 0 times theorem prover too weak. 84463 trivial. 0 not checked. [2020-07-20 10:56:27,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516657736] [2020-07-20 10:56:27,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:56:27,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 10:56:27,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997616698] [2020-07-20 10:56:27,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:56:27,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:56:27,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:56:27,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:56:27,629 INFO L87 Difference]: Start difference. First operand 146 states and 227 transitions. Second operand 22 states. [2020-07-20 10:56:28,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:56:28,482 INFO L93 Difference]: Finished difference Result 241 states and 377 transitions. [2020-07-20 10:56:28,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:56:28,486 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1249 [2020-07-20 10:56:28,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:56:28,493 INFO L225 Difference]: With dead ends: 241 [2020-07-20 10:56:28,494 INFO L226 Difference]: Without dead ends: 221 [2020-07-20 10:56:28,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2506 GetRequests, 2458 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 10:56:28,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-20 10:56:28,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 179. [2020-07-20 10:56:28,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 10:56:28,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 279 transitions. [2020-07-20 10:56:28,536 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 279 transitions. Word has length 1249 [2020-07-20 10:56:28,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:56:28,536 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 279 transitions. [2020-07-20 10:56:28,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:56:28,537 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 279 transitions. [2020-07-20 10:56:28,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1261 [2020-07-20 10:56:28,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:56:28,569 INFO L422 BasicCegarLoop]: trace histogram [185, 185, 143, 92, 92, 92, 92, 92, 92, 92, 51, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:56:28,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:28,784 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:56:28,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:56:28,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1618683645, now seen corresponding path program 19 times [2020-07-20 10:56:28,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:56:28,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147485920] [2020-07-20 10:56:28,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:29,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:56:29,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 2800 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:56:29,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:56:30,692 INFO L134 CoverageAnalysis]: Checked inductivity of 94977 backedges. 1941 proven. 6227 refuted. 0 times theorem prover too weak. 86809 trivial. 0 not checked. [2020-07-20 10:56:30,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:39,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:42,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:44,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:44,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:45,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:46,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:56:47,468 INFO L134 CoverageAnalysis]: Checked inductivity of 94977 backedges. 1950 proven. 6290 refuted. 0 times theorem prover too weak. 86737 trivial. 0 not checked. [2020-07-20 10:56:47,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147485920] [2020-07-20 10:56:47,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:56:47,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 10:56:47,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640320811] [2020-07-20 10:56:47,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:56:47,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:56:47,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:56:47,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:56:47,471 INFO L87 Difference]: Start difference. First operand 179 states and 279 transitions. Second operand 22 states. [2020-07-20 10:56:48,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:56:48,114 INFO L93 Difference]: Finished difference Result 313 states and 505 transitions. [2020-07-20 10:56:48,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:56:48,117 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1260 [2020-07-20 10:56:48,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:56:48,128 INFO L225 Difference]: With dead ends: 313 [2020-07-20 10:56:48,129 INFO L226 Difference]: Without dead ends: 273 [2020-07-20 10:56:48,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2527 GetRequests, 2482 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 10:56:48,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-20 10:56:48,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 205. [2020-07-20 10:56:48,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 10:56:48,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 323 transitions. [2020-07-20 10:56:48,204 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 323 transitions. Word has length 1260 [2020-07-20 10:56:48,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:56:48,205 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 323 transitions. [2020-07-20 10:56:48,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:56:48,205 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 323 transitions. [2020-07-20 10:56:48,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 10:56:48,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:56:48,244 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:56:48,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:48,457 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:56:48,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:56:48,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1007179458, now seen corresponding path program 20 times [2020-07-20 10:56:48,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:56:48,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427187100] [2020-07-20 10:56:48,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:49,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:56:49,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 2773 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:56:49,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:56:50,589 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2081 proven. 6971 refuted. 0 times theorem prover too weak. 84093 trivial. 0 not checked. [2020-07-20 10:56:50,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:56:59,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:03,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:05,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:05,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:05,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:05,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:06,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:06,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:06,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:06,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:07,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:08,839 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2079 proven. 7065 refuted. 0 times theorem prover too weak. 84001 trivial. 0 not checked. [2020-07-20 10:57:08,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427187100] [2020-07-20 10:57:08,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:57:08,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:57:08,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186389546] [2020-07-20 10:57:08,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:57:08,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:57:08,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:57:08,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:57:08,842 INFO L87 Difference]: Start difference. First operand 205 states and 323 transitions. Second operand 24 states. [2020-07-20 10:57:09,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:57:09,574 INFO L93 Difference]: Finished difference Result 352 states and 552 transitions. [2020-07-20 10:57:09,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:57:09,576 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1248 [2020-07-20 10:57:09,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:57:09,589 INFO L225 Difference]: With dead ends: 352 [2020-07-20 10:57:09,589 INFO L226 Difference]: Without dead ends: 312 [2020-07-20 10:57:09,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2504 GetRequests, 2454 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:57:09,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2020-07-20 10:57:09,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 184. [2020-07-20 10:57:09,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-20 10:57:09,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 286 transitions. [2020-07-20 10:57:09,646 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 286 transitions. Word has length 1248 [2020-07-20 10:57:09,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:57:09,647 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 286 transitions. [2020-07-20 10:57:09,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:57:09,647 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 286 transitions. [2020-07-20 10:57:09,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1226 [2020-07-20 10:57:09,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:57:09,677 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 144, 89, 89, 89, 89, 89, 89, 89, 55, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:57:09,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:09,891 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:57:09,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:57:09,891 INFO L82 PathProgramCache]: Analyzing trace with hash -77595158, now seen corresponding path program 21 times [2020-07-20 10:57:09,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:57:09,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170694790] [2020-07-20 10:57:09,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:11,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:57:11,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 2721 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:57:11,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:57:11,832 INFO L134 CoverageAnalysis]: Checked inductivity of 89684 backedges. 5934 proven. 2625 refuted. 0 times theorem prover too weak. 81125 trivial. 0 not checked. [2020-07-20 10:57:11,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:57:17,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:19,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:20,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:20,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:21,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:21,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:22,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:23,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:28,819 INFO L134 CoverageAnalysis]: Checked inductivity of 89684 backedges. 5946 proven. 2707 refuted. 0 times theorem prover too weak. 81031 trivial. 0 not checked. [2020-07-20 10:57:28,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170694790] [2020-07-20 10:57:28,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:57:28,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 10:57:28,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026703842] [2020-07-20 10:57:28,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:57:28,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:57:28,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:57:28,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:57:28,823 INFO L87 Difference]: Start difference. First operand 184 states and 286 transitions. Second operand 22 states. [2020-07-20 10:57:29,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:57:29,558 INFO L93 Difference]: Finished difference Result 266 states and 412 transitions. [2020-07-20 10:57:29,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:57:29,558 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1225 [2020-07-20 10:57:29,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:57:29,566 INFO L225 Difference]: With dead ends: 266 [2020-07-20 10:57:29,566 INFO L226 Difference]: Without dead ends: 259 [2020-07-20 10:57:29,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2458 GetRequests, 2410 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 10:57:29,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-07-20 10:57:29,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 189. [2020-07-20 10:57:29,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-20 10:57:29,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 294 transitions. [2020-07-20 10:57:29,603 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 294 transitions. Word has length 1225 [2020-07-20 10:57:29,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:57:29,604 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 294 transitions. [2020-07-20 10:57:29,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:57:29,605 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 294 transitions. [2020-07-20 10:57:29,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1237 [2020-07-20 10:57:29,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:57:29,625 INFO L422 BasicCegarLoop]: trace histogram [181, 181, 143, 90, 90, 90, 90, 90, 90, 90, 53, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:57:29,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:29,840 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:57:29,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:57:29,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1429871315, now seen corresponding path program 22 times [2020-07-20 10:57:29,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:57:29,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95496284] [2020-07-20 10:57:29,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:31,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:57:31,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:57:31,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:57:31,820 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3540 proven. 4468 refuted. 0 times theorem prover too weak. 83325 trivial. 0 not checked. [2020-07-20 10:57:31,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:57:40,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:40,605 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-20 10:57:42,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:43,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:43,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:44,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:44,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:45,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:46,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:57:49,754 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3545 proven. 4535 refuted. 0 times theorem prover too weak. 83253 trivial. 0 not checked. [2020-07-20 10:57:49,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95496284] [2020-07-20 10:57:49,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:57:49,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 10:57:49,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941092937] [2020-07-20 10:57:49,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:57:49,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:57:49,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:57:49,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:57:49,757 INFO L87 Difference]: Start difference. First operand 189 states and 294 transitions. Second operand 22 states. [2020-07-20 10:57:50,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:57:50,595 INFO L93 Difference]: Finished difference Result 394 states and 621 transitions. [2020-07-20 10:57:50,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:57:50,602 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1236 [2020-07-20 10:57:50,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:57:50,623 INFO L225 Difference]: With dead ends: 394 [2020-07-20 10:57:50,623 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 10:57:50,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2479 GetRequests, 2434 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 10:57:50,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 10:57:50,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 235. [2020-07-20 10:57:50,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 10:57:50,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 368 transitions. [2020-07-20 10:57:50,722 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 368 transitions. Word has length 1236 [2020-07-20 10:57:50,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:57:50,724 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 368 transitions. [2020-07-20 10:57:50,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:57:50,725 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 368 transitions. [2020-07-20 10:57:50,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1237 [2020-07-20 10:57:50,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:57:50,772 INFO L422 BasicCegarLoop]: trace histogram [181, 181, 143, 90, 90, 90, 90, 90, 90, 90, 53, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:57:51,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:51,078 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:57:51,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:57:51,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1850033875, now seen corresponding path program 23 times [2020-07-20 10:57:51,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:57:51,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403763596] [2020-07-20 10:57:51,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:57:52,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:57:52,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 2746 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:57:52,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:57:53,056 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3936 proven. 5026 refuted. 0 times theorem prover too weak. 82371 trivial. 0 not checked. [2020-07-20 10:57:53,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:57:55,903 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 10:58:02,915 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 48 [2020-07-20 10:58:03,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:04,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:06,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:06,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:07,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:07,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:08,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:08,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:08,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:08,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:08,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:09,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:09,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:09,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:09,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:13,197 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3930 proven. 5124 refuted. 0 times theorem prover too weak. 82279 trivial. 0 not checked. [2020-07-20 10:58:13,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403763596] [2020-07-20 10:58:13,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:58:13,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:58:13,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715670344] [2020-07-20 10:58:13,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:58:13,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:58:13,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:58:13,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:58:13,202 INFO L87 Difference]: Start difference. First operand 235 states and 368 transitions. Second operand 24 states. [2020-07-20 10:58:14,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:58:14,020 INFO L93 Difference]: Finished difference Result 584 states and 929 transitions. [2020-07-20 10:58:14,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:58:14,022 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1236 [2020-07-20 10:58:14,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:58:14,037 INFO L225 Difference]: With dead ends: 584 [2020-07-20 10:58:14,038 INFO L226 Difference]: Without dead ends: 548 [2020-07-20 10:58:14,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2480 GetRequests, 2430 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:58:14,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2020-07-20 10:58:14,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 245. [2020-07-20 10:58:14,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-20 10:58:14,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 381 transitions. [2020-07-20 10:58:14,120 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 381 transitions. Word has length 1236 [2020-07-20 10:58:14,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:58:14,122 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 381 transitions. [2020-07-20 10:58:14,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:58:14,122 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 381 transitions. [2020-07-20 10:58:14,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1214 [2020-07-20 10:58:14,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:58:14,144 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 144, 88, 88, 88, 88, 88, 88, 88, 56, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:58:14,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:58:14,358 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:58:14,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:58:14,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1949099003, now seen corresponding path program 24 times [2020-07-20 10:58:14,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:58:14,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593688153] [2020-07-20 10:58:14,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:58:15,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:58:15,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 2694 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 10:58:15,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:58:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 2563 proven. 5910 refuted. 0 times theorem prover too weak. 79439 trivial. 0 not checked. [2020-07-20 10:58:16,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:58:27,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:31,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:31,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:32,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:32,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:33,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:34,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:35,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:37,221 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 2579 proven. 5988 refuted. 0 times theorem prover too weak. 79345 trivial. 0 not checked. [2020-07-20 10:58:37,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593688153] [2020-07-20 10:58:37,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:58:37,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 10:58:37,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200956491] [2020-07-20 10:58:37,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:58:37,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:58:37,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:58:37,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:58:37,225 INFO L87 Difference]: Start difference. First operand 245 states and 381 transitions. Second operand 22 states. [2020-07-20 10:58:37,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:58:37,942 INFO L93 Difference]: Finished difference Result 304 states and 467 transitions. [2020-07-20 10:58:37,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:58:37,943 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1213 [2020-07-20 10:58:37,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:58:37,951 INFO L225 Difference]: With dead ends: 304 [2020-07-20 10:58:37,952 INFO L226 Difference]: Without dead ends: 287 [2020-07-20 10:58:37,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2434 GetRequests, 2386 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 10:58:37,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2020-07-20 10:58:37,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 222. [2020-07-20 10:58:37,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 10:58:37,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 341 transitions. [2020-07-20 10:58:38,000 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 341 transitions. Word has length 1213 [2020-07-20 10:58:38,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:58:38,001 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 341 transitions. [2020-07-20 10:58:38,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:58:38,001 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 341 transitions. [2020-07-20 10:58:38,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 10:58:38,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:58:38,024 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:58:38,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:58:38,238 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:58:38,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:58:38,239 INFO L82 PathProgramCache]: Analyzing trace with hash -121718324, now seen corresponding path program 25 times [2020-07-20 10:58:38,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:58:38,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795570885] [2020-07-20 10:58:38,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:58:39,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:58:39,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 2773 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:58:39,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:58:40,396 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2482 proven. 5606 refuted. 0 times theorem prover too weak. 85057 trivial. 0 not checked. [2020-07-20 10:58:40,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:58:43,932 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 46 [2020-07-20 10:58:50,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:54,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:54,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:55,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:55,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:56,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:56,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:57,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:58,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:58,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:58,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:58:59,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2489 proven. 5671 refuted. 0 times theorem prover too weak. 84985 trivial. 0 not checked. [2020-07-20 10:59:01,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795570885] [2020-07-20 10:59:01,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:59:01,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 10:59:01,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605650136] [2020-07-20 10:59:01,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:59:01,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:59:01,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:59:01,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:59:01,887 INFO L87 Difference]: Start difference. First operand 222 states and 341 transitions. Second operand 22 states. [2020-07-20 10:59:02,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:59:02,858 INFO L93 Difference]: Finished difference Result 389 states and 603 transitions. [2020-07-20 10:59:02,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:59:02,863 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1248 [2020-07-20 10:59:02,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:59:02,879 INFO L225 Difference]: With dead ends: 389 [2020-07-20 10:59:02,879 INFO L226 Difference]: Without dead ends: 359 [2020-07-20 10:59:02,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2503 GetRequests, 2458 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 10:59:02,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-20 10:59:02,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 222. [2020-07-20 10:59:02,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 10:59:02,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 341 transitions. [2020-07-20 10:59:02,948 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 341 transitions. Word has length 1248 [2020-07-20 10:59:02,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:59:02,949 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 341 transitions. [2020-07-20 10:59:02,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:59:02,949 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 341 transitions. [2020-07-20 10:59:02,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 10:59:02,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:59:02,968 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:59:03,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:03,169 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:59:03,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:59:03,171 INFO L82 PathProgramCache]: Analyzing trace with hash 793055692, now seen corresponding path program 26 times [2020-07-20 10:59:03,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:59:03,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933817739] [2020-07-20 10:59:03,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:04,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:59:04,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 2773 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:59:04,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:59:05,726 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2727 proven. 6325 refuted. 0 times theorem prover too weak. 84093 trivial. 0 not checked. [2020-07-20 10:59:05,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:59:07,795 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 10:59:07,899 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 10:59:09,633 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:59:09,739 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:59:09,950 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 10:59:10,067 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:59:10,318 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 52 [2020-07-20 10:59:17,610 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-07-20 10:59:17,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:22,487 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 40 [2020-07-20 10:59:22,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:22,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:24,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:24,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:25,395 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 10:59:25,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:25,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:26,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:26,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:27,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:27,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:27,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:27,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:28,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2723 proven. 6421 refuted. 0 times theorem prover too weak. 84001 trivial. 0 not checked. [2020-07-20 10:59:30,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933817739] [2020-07-20 10:59:30,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:59:30,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 10:59:30,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282335156] [2020-07-20 10:59:30,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 10:59:30,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:59:30,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 10:59:30,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 10:59:30,707 INFO L87 Difference]: Start difference. First operand 222 states and 341 transitions. Second operand 24 states. [2020-07-20 10:59:31,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:59:31,635 INFO L93 Difference]: Finished difference Result 373 states and 573 transitions. [2020-07-20 10:59:31,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:59:31,637 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1248 [2020-07-20 10:59:31,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:59:31,649 INFO L225 Difference]: With dead ends: 373 [2020-07-20 10:59:31,649 INFO L226 Difference]: Without dead ends: 343 [2020-07-20 10:59:31,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2504 GetRequests, 2454 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 10:59:31,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2020-07-20 10:59:31,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 176. [2020-07-20 10:59:31,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 10:59:31,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 261 transitions. [2020-07-20 10:59:31,703 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 261 transitions. Word has length 1248 [2020-07-20 10:59:31,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:59:31,704 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 261 transitions. [2020-07-20 10:59:31,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 10:59:31,704 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 261 transitions. [2020-07-20 10:59:31,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 10:59:31,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:59:31,726 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:59:31,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:31,940 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:59:31,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:59:31,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1018676894, now seen corresponding path program 27 times [2020-07-20 10:59:31,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:59:31,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692408766] [2020-07-20 10:59:31,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:33,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:59:33,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:59:33,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:59:34,013 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 5501 proven. 2427 refuted. 0 times theorem prover too weak. 81613 trivial. 0 not checked. [2020-07-20 10:59:34,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:59:40,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:42,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:42,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:44,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:44,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:45,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:46,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:46,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:46,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:46,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:46,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:47,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:59:54,549 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 5504 proven. 2496 refuted. 0 times theorem prover too weak. 81541 trivial. 0 not checked. [2020-07-20 10:59:54,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692408766] [2020-07-20 10:59:54,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:59:54,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 10:59:54,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94224437] [2020-07-20 10:59:54,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 10:59:54,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:59:54,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 10:59:54,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 10:59:54,551 INFO L87 Difference]: Start difference. First operand 176 states and 261 transitions. Second operand 22 states. [2020-07-20 10:59:55,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:59:55,301 INFO L93 Difference]: Finished difference Result 365 states and 546 transitions. [2020-07-20 10:59:55,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 10:59:55,302 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1224 [2020-07-20 10:59:55,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:59:55,310 INFO L225 Difference]: With dead ends: 365 [2020-07-20 10:59:55,310 INFO L226 Difference]: Without dead ends: 358 [2020-07-20 10:59:55,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2455 GetRequests, 2410 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 10:59:55,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2020-07-20 10:59:55,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 204. [2020-07-20 10:59:55,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 10:59:55,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 301 transitions. [2020-07-20 10:59:55,358 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 301 transitions. Word has length 1224 [2020-07-20 10:59:55,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:59:55,358 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 301 transitions. [2020-07-20 10:59:55,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 10:59:55,359 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 301 transitions. [2020-07-20 10:59:55,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 10:59:55,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:59:55,377 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:59:55,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:55,592 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:59:55,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:59:55,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1991897758, now seen corresponding path program 28 times [2020-07-20 10:59:55,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:59:55,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335664171] [2020-07-20 10:59:55,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:59:56,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:59:56,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 10:59:57,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:59:57,913 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 6141 proven. 2731 refuted. 0 times theorem prover too weak. 80669 trivial. 0 not checked. [2020-07-20 10:59:57,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:59:59,542 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 11:00:01,203 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:00:01,312 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:00:01,418 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:00:01,525 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:00:05,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:05,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,284 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:00:08,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:08,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:10,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:11,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:11,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:12,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:12,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:12,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:13,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:14,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:20,645 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 6133 proven. 2831 refuted. 0 times theorem prover too weak. 80577 trivial. 0 not checked. [2020-07-20 11:00:20,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335664171] [2020-07-20 11:00:20,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:20,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 11:00:20,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613227927] [2020-07-20 11:00:20,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:00:20,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:20,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:00:20,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:20,647 INFO L87 Difference]: Start difference. First operand 204 states and 301 transitions. Second operand 24 states. [2020-07-20 11:00:21,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:21,532 INFO L93 Difference]: Finished difference Result 565 states and 863 transitions. [2020-07-20 11:00:21,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:00:21,535 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1224 [2020-07-20 11:00:21,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:21,549 INFO L225 Difference]: With dead ends: 565 [2020-07-20 11:00:21,549 INFO L226 Difference]: Without dead ends: 467 [2020-07-20 11:00:21,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2456 GetRequests, 2406 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:00:21,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2020-07-20 11:00:21,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 111. [2020-07-20 11:00:21,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-07-20 11:00:21,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2020-07-20 11:00:21,594 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 161 transitions. Word has length 1224 [2020-07-20 11:00:21,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:21,594 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-07-20 11:00:21,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:00:21,595 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 161 transitions. [2020-07-20 11:00:21,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1214 [2020-07-20 11:00:21,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:21,608 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 144, 88, 88, 88, 88, 88, 88, 88, 56, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:21,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,823 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:21,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:21,823 INFO L82 PathProgramCache]: Analyzing trace with hash -666509037, now seen corresponding path program 29 times [2020-07-20 11:00:21,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:21,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481070974] [2020-07-20 11:00:21,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:23,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:23,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 2694 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:00:23,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:23,891 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 1350 proven. 8051 refuted. 0 times theorem prover too weak. 78511 trivial. 0 not checked. [2020-07-20 11:00:23,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:34,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:41,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:41,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:42,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:45,857 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 1366 proven. 8152 refuted. 0 times theorem prover too weak. 78394 trivial. 0 not checked. [2020-07-20 11:00:45,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481070974] [2020-07-20 11:00:45,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:45,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 11:00:45,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093222801] [2020-07-20 11:00:45,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:00:45,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:45,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:00:45,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:45,859 INFO L87 Difference]: Start difference. First operand 111 states and 161 transitions. Second operand 24 states. [2020-07-20 11:00:46,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:46,932 INFO L93 Difference]: Finished difference Result 324 states and 482 transitions. [2020-07-20 11:00:46,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:00:46,935 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1213 [2020-07-20 11:00:46,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:46,940 INFO L225 Difference]: With dead ends: 324 [2020-07-20 11:00:46,940 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:00:46,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2435 GetRequests, 2382 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:00:46,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:00:46,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 11:00:46,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 11:00:46,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 132 transitions. [2020-07-20 11:00:46,960 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 132 transitions. Word has length 1213 [2020-07-20 11:00:46,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:46,960 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 132 transitions. [2020-07-20 11:00:46,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:00:46,961 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 132 transitions. [2020-07-20 11:00:46,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 11:00:46,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:46,974 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:47,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:47,184 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:47,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:47,185 INFO L82 PathProgramCache]: Analyzing trace with hash 221687074, now seen corresponding path program 30 times [2020-07-20 11:00:47,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:47,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539465765] [2020-07-20 11:00:47,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:48,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:48,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 11:00:48,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:49,357 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1425 proven. 7447 refuted. 0 times theorem prover too weak. 80669 trivial. 0 not checked. [2020-07-20 11:00:49,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:59,942 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:01:00,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:00,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:04,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:07,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,800 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 8 DAG size of output: 6 [2020-07-20 11:01:08,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:08,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:09,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:09,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,645 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1431 proven. 7533 refuted. 0 times theorem prover too weak. 80577 trivial. 0 not checked. [2020-07-20 11:01:11,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539465765] [2020-07-20 11:01:11,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:11,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 11:01:11,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393106053] [2020-07-20 11:01:11,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:01:11,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:11,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:01:11,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:01:11,648 INFO L87 Difference]: Start difference. First operand 108 states and 132 transitions. Second operand 24 states. [2020-07-20 11:01:12,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:12,466 INFO L93 Difference]: Finished difference Result 150 states and 180 transitions. [2020-07-20 11:01:12,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:12,469 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1224 [2020-07-20 11:01:12,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:12,472 INFO L225 Difference]: With dead ends: 150 [2020-07-20 11:01:12,472 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 11:01:12,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2456 GetRequests, 2406 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:01:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 11:01:12,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 11:01:12,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 11:01:12,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 121 transitions. [2020-07-20 11:01:12,486 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 121 transitions. Word has length 1224 [2020-07-20 11:01:12,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:12,487 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 121 transitions. [2020-07-20 11:01:12,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:01:12,487 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 121 transitions. [2020-07-20 11:01:12,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 11:01:12,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:12,497 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:12,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:12,698 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:12,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:12,699 INFO L82 PathProgramCache]: Analyzing trace with hash -69238494, now seen corresponding path program 31 times [2020-07-20 11:01:12,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:12,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698898414] [2020-07-20 11:01:12,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:14,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:14,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 11:01:14,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:15,092 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1438 proven. 8365 refuted. 0 times theorem prover too weak. 79738 trivial. 0 not checked. [2020-07-20 11:01:15,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:19,668 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 53 [2020-07-20 11:01:27,000 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:01:27,114 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:01:27,228 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:01:27,339 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:01:27,454 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:01:27,558 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:01:28,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:28,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,197 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-07-20 11:01:33,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:36,352 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-07-20 11:01:36,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:36,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:38,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:40,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:40,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:40,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:41,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:41,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:41,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:41,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:42,666 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1429 proven. 8491 refuted. 0 times theorem prover too weak. 79621 trivial. 0 not checked. [2020-07-20 11:01:42,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698898414] [2020-07-20 11:01:42,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:42,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 24] total 26 [2020-07-20 11:01:42,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967882241] [2020-07-20 11:01:42,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 11:01:42,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:42,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 11:01:42,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:01:42,668 INFO L87 Difference]: Start difference. First operand 103 states and 121 transitions. Second operand 26 states. [2020-07-20 11:01:43,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:43,937 INFO L93 Difference]: Finished difference Result 267 states and 320 transitions. [2020-07-20 11:01:43,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:01:43,941 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1224 [2020-07-20 11:01:43,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:43,946 INFO L225 Difference]: With dead ends: 267 [2020-07-20 11:01:43,946 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:01:43,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2402 SyntacticMatches, 21 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=432, Invalid=828, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 11:01:43,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:01:43,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:01:43,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:01:43,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:01:43,955 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1224 [2020-07-20 11:01:43,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:43,955 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:01:43,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 11:01:43,955 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:01:43,956 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:01:44,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:44,173 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:01:51,649 WARN L193 SmtUtils]: Spent 7.39 s on a formula simplification. DAG size of input: 734 DAG size of output: 301 [2020-07-20 11:01:52,156 WARN L193 SmtUtils]: Spent 503.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 86 [2020-07-20 11:01:58,179 WARN L193 SmtUtils]: Spent 6.02 s on a formula simplification. DAG size of input: 734 DAG size of output: 301 [2020-07-20 11:02:14,052 WARN L193 SmtUtils]: Spent 15.87 s on a formula simplification. DAG size of input: 947 DAG size of output: 455 [2020-07-20 11:02:25,056 WARN L193 SmtUtils]: Spent 11.00 s on a formula simplification. DAG size of input: 901 DAG size of output: 390 [2020-07-20 11:02:40,475 WARN L193 SmtUtils]: Spent 15.41 s on a formula simplification. DAG size of input: 951 DAG size of output: 459 [2020-07-20 11:02:40,896 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 88 [2020-07-20 11:02:41,730 WARN L193 SmtUtils]: Spent 831.00 ms on a formula simplification. DAG size of input: 423 DAG size of output: 123 [2020-07-20 11:02:56,376 WARN L193 SmtUtils]: Spent 14.64 s on a formula simplification. DAG size of input: 944 DAG size of output: 449 [2020-07-20 11:03:02,241 WARN L193 SmtUtils]: Spent 5.86 s on a formula simplification. DAG size of input: 735 DAG size of output: 300 [2020-07-20 11:03:16,678 WARN L193 SmtUtils]: Spent 14.43 s on a formula simplification. DAG size of input: 944 DAG size of output: 449 [2020-07-20 11:03:17,099 WARN L193 SmtUtils]: Spent 417.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 88 [2020-07-20 11:03:17,951 WARN L193 SmtUtils]: Spent 849.00 ms on a formula simplification. DAG size of input: 423 DAG size of output: 123 [2020-07-20 11:03:25,450 WARN L193 SmtUtils]: Spent 7.49 s on a formula simplification. DAG size of input: 777 DAG size of output: 326 [2020-07-20 11:03:31,374 WARN L193 SmtUtils]: Spent 5.92 s on a formula simplification. DAG size of input: 735 DAG size of output: 300 [2020-07-20 11:03:48,786 WARN L193 SmtUtils]: Spent 17.41 s on a formula simplification. DAG size of input: 997 DAG size of output: 410 [2020-07-20 11:04:03,068 WARN L193 SmtUtils]: Spent 14.28 s on a formula simplification. DAG size of input: 947 DAG size of output: 455 [2020-07-20 11:04:03,485 WARN L193 SmtUtils]: Spent 412.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 88 [2020-07-20 11:04:06,835 WARN L193 SmtUtils]: Spent 3.35 s on a formula simplification. DAG size of input: 875 DAG size of output: 394