/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_15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:44:27,512 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:44:27,515 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:44:27,528 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:44:27,528 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:44:27,529 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:44:27,531 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:44:27,532 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:44:27,534 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:44:27,535 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:44:27,536 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:44:27,537 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:44:27,537 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:44:27,538 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:44:27,540 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:44:27,541 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:44:27,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:44:27,542 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:44:27,544 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:44:27,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:44:27,551 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:44:27,554 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:44:27,555 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:44:27,556 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:44:27,562 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:44:27,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:44:27,576 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:44:27,577 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:44:27,578 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 10:44:27,608 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:44:27,608 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:44:27,610 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:44:27,611 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:44:27,611 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:44:27,611 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:44:27,611 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:44:27,612 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:44:27,612 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:44:27,612 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:44:27,613 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:44:27,613 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:44:27,614 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:44:27,614 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:44:27,614 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:44:27,615 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:44:27,615 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:44:27,615 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:44:27,615 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:44:27,615 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:44:27,616 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:44:27,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:44:27,616 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:44:27,616 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:44:27,617 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:44:27,617 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:44:27,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:27,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:44:27,617 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:44:27,618 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 10:44:27,919 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:44:27,931 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:44:27,935 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:44:27,936 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:44:27,936 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:44:27,937 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 10:44:28,022 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6c736f50/6945dee4922646088fbdac1138ebdb36/FLAGe2c75aa65 [2020-07-21 10:44:28,487 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:44:28,488 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 10:44:28,493 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6c736f50/6945dee4922646088fbdac1138ebdb36/FLAGe2c75aa65 [2020-07-21 10:44:28,865 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6c736f50/6945dee4922646088fbdac1138ebdb36 [2020-07-21 10:44:28,875 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:44:28,878 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:44:28,879 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:44:28,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:44:28,883 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:44:28,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:44:28" (1/1) ... [2020-07-21 10:44:28,888 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9c8426 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:28, skipping insertion in model container [2020-07-21 10:44:28,888 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:44:28" (1/1) ... [2020-07-21 10:44:28,897 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:44:28,915 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:44:29,073 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:44:29,077 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:44:29,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:44:29,107 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:44:29,108 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29 WrapperNode [2020-07-21 10:44:29,108 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:44:29,109 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:44:29,109 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:44:29,109 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:44:29,121 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,121 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,126 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,126 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,129 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,131 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... [2020-07-21 10:44:29,133 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:44:29,134 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:44:29,134 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:44:29,134 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:44:29,135 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:44:29,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:44:29,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:44:29,284 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 10:44:29,284 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:44:29,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:44:29,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:44:29,284 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 10:44:29,284 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:44:29,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:44:29,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:44:29,468 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:44:29,468 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:44:29,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:44:29 BoogieIcfgContainer [2020-07-21 10:44:29,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:44:29,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:44:29,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:44:29,490 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:44:29,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:44:28" (1/3) ... [2020-07-21 10:44:29,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7ef136 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:44:29, skipping insertion in model container [2020-07-21 10:44:29,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:44:29" (2/3) ... [2020-07-21 10:44:29,493 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7ef136 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:44:29, skipping insertion in model container [2020-07-21 10:44:29,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:44:29" (3/3) ... [2020-07-21 10:44:29,497 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-2.c [2020-07-21 10:44:29,514 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:44:29,524 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:44:29,560 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:44:29,607 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:44:29,607 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:44:29,607 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:44:29,607 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:44:29,608 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:44:29,608 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:44:29,608 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:44:29,608 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:44:29,625 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 10:44:29,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:44:29,630 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:29,632 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:29,632 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:29,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:29,637 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 10:44:29,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:29,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952924014] [2020-07-21 10:44:29,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:29,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:29,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:44:29,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:29,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:44:29,811 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:44:29,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952924014] [2020-07-21 10:44:29,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:44:29,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:44:29,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033821420] [2020-07-21 10:44:29,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:44:29,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:29,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:44:29,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:44:29,839 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 10:44:29,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:29,946 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 10:44:29,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:44:29,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:44:29,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:29,958 INFO L225 Difference]: With dead ends: 35 [2020-07-21 10:44:29,958 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 10:44:29,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:44:29,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 10:44:30,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 10:44:30,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:44:30,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:44:30,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 10:44:30,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:30,028 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:44:30,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:44:30,030 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:44:30,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:44:30,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:30,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:30,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:30,264 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:30,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:30,266 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 10:44:30,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:30,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955517290] [2020-07-21 10:44:30,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:30,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:30,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:44:30,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 10:44:30,346 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:44:30,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955517290] [2020-07-21 10:44:30,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:44:30,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:44:30,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662728054] [2020-07-21 10:44:30,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:44:30,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:30,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:44:30,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:44:30,352 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 10:44:30,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:30,448 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 10:44:30,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:44:30,450 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:44:30,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:30,451 INFO L225 Difference]: With dead ends: 27 [2020-07-21 10:44:30,451 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 10:44:30,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:44:30,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 10:44:30,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 10:44:30,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:44:30,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:44:30,461 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 10:44:30,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:30,461 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:44:30,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:44:30,462 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:44:30,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:44:30,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:30,464 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:30,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:30,677 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:30,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:30,678 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 10:44:30,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:30,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737457129] [2020-07-21 10:44:30,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:30,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:30,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:44:30,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:30,759 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:44:30,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:30,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:31,059 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:44:31,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737457129] [2020-07-21 10:44:31,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:31,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:44:31,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196185731] [2020-07-21 10:44:31,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:44:31,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:31,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:44:31,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:44:31,065 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 10:44:31,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:31,176 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 10:44:31,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:44:31,177 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:44:31,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:31,179 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:44:31,179 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:44:31,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:31,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:44:31,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 10:44:31,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:44:31,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:44:31,189 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 10:44:31,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:31,190 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:44:31,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:44:31,190 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:44:31,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:44:31,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:31,192 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:31,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:31,408 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:31,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:31,409 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 10:44:31,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:31,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722508047] [2020-07-21 10:44:31,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:31,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:31,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:44:31,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:31,477 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 10:44:31,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:31,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:31,633 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:44:31,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722508047] [2020-07-21 10:44:31,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:31,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:44:31,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040123577] [2020-07-21 10:44:31,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:44:31,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:31,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:44:31,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:44:31,636 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 10:44:31,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:31,741 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 10:44:31,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:44:31,742 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 10:44:31,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:31,747 INFO L225 Difference]: With dead ends: 37 [2020-07-21 10:44:31,747 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 10:44:31,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:31,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 10:44:31,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 10:44:31,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:44:31,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:44:31,762 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 10:44:31,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:31,763 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:44:31,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:44:31,763 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:44:31,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:44:31,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:31,767 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:31,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:31,983 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:31,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:31,984 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 10:44:31,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:31,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1731534859] [2020-07-21 10:44:31,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:32,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:32,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:44:32,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:32,073 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 10:44:32,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:32,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:32,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:32,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:32,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:32,454 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:44:32,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1731534859] [2020-07-21 10:44:32,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:32,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:44:32,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110842907] [2020-07-21 10:44:32,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:44:32,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:32,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:44:32,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:32,458 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 10:44:32,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:32,622 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 10:44:32,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:44:32,622 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 10:44:32,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:32,625 INFO L225 Difference]: With dead ends: 42 [2020-07-21 10:44:32,625 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 10:44:32,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:44:32,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 10:44:32,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 10:44:32,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:44:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:44:32,643 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 10:44:32,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:32,644 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:44:32,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:44:32,644 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:44:32,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 10:44:32,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:32,649 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:32,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:32,865 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:32,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:32,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 10:44:32,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:32,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524726696] [2020-07-21 10:44:32,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:32,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:32,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:44:32,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:32,956 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 10:44:32,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:33,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:33,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:33,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:33,288 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:44:33,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524726696] [2020-07-21 10:44:33,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:33,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:44:33,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535815171] [2020-07-21 10:44:33,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:44:33,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:33,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:44:33,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:44:33,291 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 10:44:33,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:33,442 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 10:44:33,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:44:33,443 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 10:44:33,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:33,449 INFO L225 Difference]: With dead ends: 47 [2020-07-21 10:44:33,449 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 10:44:33,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:44:33,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 10:44:33,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 10:44:33,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:44:33,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:44:33,476 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 10:44:33,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:33,477 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:44:33,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:44:33,478 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:44:33,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 10:44:33,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:33,484 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:33,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:33,699 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:33,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:33,700 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 10:44:33,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:33,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73616148] [2020-07-21 10:44:33,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:33,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:33,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:44:33,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:33,827 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 10:44:33,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:34,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,457 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 10:44:34,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73616148] [2020-07-21 10:44:34,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:34,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:44:34,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591254150] [2020-07-21 10:44:34,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:44:34,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:34,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:44:34,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:44:34,462 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 10:44:34,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:34,621 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 10:44:34,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:44:34,622 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 10:44:34,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:34,624 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:44:34,625 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 10:44:34,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:34,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 10:44:34,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 10:44:34,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:44:34,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:44:34,637 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 10:44:34,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:34,637 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:44:34,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:44:34,638 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:44:34,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 10:44:34,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:34,642 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:34,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:34,850 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:34,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:34,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 10:44:34,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:34,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795318910] [2020-07-21 10:44:34,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:34,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:34,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:44:34,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:34,964 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 10:44:34,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:35,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,604 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 10:44:35,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795318910] [2020-07-21 10:44:35,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:35,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:44:35,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883278194] [2020-07-21 10:44:35,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:44:35,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:35,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:44:35,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:44:35,607 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 10:44:35,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:35,754 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 10:44:35,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:44:35,754 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 10:44:35,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:35,757 INFO L225 Difference]: With dead ends: 57 [2020-07-21 10:44:35,757 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 10:44:35,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:35,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 10:44:35,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 10:44:35,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:44:35,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:44:35,771 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 10:44:35,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:35,772 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:44:35,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:44:35,772 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:44:35,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 10:44:35,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:35,774 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:35,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:35,988 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:35,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:35,989 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 10:44:35,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:35,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823497108] [2020-07-21 10:44:35,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:36,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:36,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:44:36,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:36,139 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 10:44:36,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:36,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:36,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:36,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:37,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:37,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:37,110 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 10:44:37,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823497108] [2020-07-21 10:44:37,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:37,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:44:37,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887428331] [2020-07-21 10:44:37,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:44:37,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:37,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:44:37,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:44:37,113 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 10:44:37,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:37,423 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 10:44:37,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:44:37,423 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 10:44:37,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:37,425 INFO L225 Difference]: With dead ends: 62 [2020-07-21 10:44:37,425 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 10:44:37,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:44:37,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 10:44:37,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 10:44:37,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:44:37,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:44:37,440 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 10:44:37,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:37,441 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:44:37,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:44:37,441 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:44:37,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 10:44:37,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:37,444 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:37,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:37,660 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:37,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:37,660 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 10:44:37,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:37,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129224958] [2020-07-21 10:44:37,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:37,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:37,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:44:37,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:37,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 10:44:37,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:38,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:38,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 10:44:38,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129224958] [2020-07-21 10:44:38,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:38,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:44:38,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453185884] [2020-07-21 10:44:38,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:44:38,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:38,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:44:38,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:44:38,932 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 10:44:39,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:39,095 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 10:44:39,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:44:39,096 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 10:44:39,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:39,099 INFO L225 Difference]: With dead ends: 67 [2020-07-21 10:44:39,099 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 10:44:39,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:44:39,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 10:44:39,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 10:44:39,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:44:39,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:44:39,112 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 10:44:39,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:39,113 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:44:39,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:44:39,113 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:44:39,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 10:44:39,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:39,117 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:39,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:39,331 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:39,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:39,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 10:44:39,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:39,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170936851] [2020-07-21 10:44:39,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:39,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:39,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:44:39,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:39,570 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 10:44:39,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:40,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:41,513 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 10:44:41,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170936851] [2020-07-21 10:44:41,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:41,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:41,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004008626] [2020-07-21 10:44:41,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:41,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:41,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:41,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:41,526 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 10:44:41,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:41,763 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 10:44:41,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:41,764 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 10:44:41,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:41,767 INFO L225 Difference]: With dead ends: 72 [2020-07-21 10:44:41,767 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 10:44:41,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:41,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 10:44:41,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 10:44:41,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:41,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:41,797 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 10:44:41,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:41,800 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:41,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:41,800 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:41,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 10:44:41,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:41,807 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] [2020-07-21 10:44:42,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,021 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:42,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:42,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 10:44:42,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:42,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657423856] [2020-07-21 10:44:42,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:42,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:42,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:44:42,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:42,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 10:44:42,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:43,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:43,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:44,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 10:44:44,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657423856] [2020-07-21 10:44:44,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:44,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:44,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858885644] [2020-07-21 10:44:44,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:44,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:44,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:44,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:44,237 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 10:44:44,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:44,467 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 10:44:44,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:44,467 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 10:44:44,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:44,470 INFO L225 Difference]: With dead ends: 77 [2020-07-21 10:44:44,471 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 10:44:44,471 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 [2020-07-21 10:44:44,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 10:44:44,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 10:44:44,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:44,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:44,483 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 10:44:44,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:44,484 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:44,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:44,484 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:44,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 10:44:44,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:44,496 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] [2020-07-21 10:44:44,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:44,712 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:44,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:44,712 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 10:44:44,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:44,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565118838] [2020-07-21 10:44:44,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:44,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:44,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:44:44,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:45,144 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 10:44:45,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:47,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,458 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 10:44:48,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565118838] [2020-07-21 10:44:48,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:48,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:44:48,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640620520] [2020-07-21 10:44:48,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:44:48,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:48,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:44:48,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:44:48,461 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 10:44:48,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:48,940 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 10:44:48,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:44:48,941 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 10:44:48,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:48,945 INFO L225 Difference]: With dead ends: 82 [2020-07-21 10:44:48,945 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 10:44:48,946 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 [2020-07-21 10:44:48,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 10:44:48,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 10:44:48,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:44:48,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:44:48,959 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 10:44:48,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:48,960 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:44:48,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:44:48,961 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:44:48,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 10:44:48,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:48,965 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:49,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:49,180 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:49,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:49,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 10:44:49,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:49,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882092235] [2020-07-21 10:44:49,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:49,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:49,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:44:49,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:49,558 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 10:44:49,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:51,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:51,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:51,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:52,722 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 10:44:52,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882092235] [2020-07-21 10:44:52,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:52,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:44:52,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067261155] [2020-07-21 10:44:52,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:44:52,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:52,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:44:52,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:44:52,725 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 10:44:53,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:53,010 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 10:44:53,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:44:53,010 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 10:44:53,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:53,014 INFO L225 Difference]: With dead ends: 87 [2020-07-21 10:44:53,014 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 10:44:53,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:44:53,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 10:44:53,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 10:44:53,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:44:53,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:44:53,028 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 10:44:53,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:53,029 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:44:53,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:44:53,030 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:44:53,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 10:44:53,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:53,042 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] [2020-07-21 10:44:53,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:53,257 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:53,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:53,258 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 10:44:53,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:53,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87243764] [2020-07-21 10:44:53,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:53,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:53,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 2380 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:44:53,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:54,368 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 10:44:54,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:58,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:58,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:59,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:00,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:01,129 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 10:45:01,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87243764] [2020-07-21 10:45:01,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:01,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:01,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568045727] [2020-07-21 10:45:01,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:01,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:01,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:01,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:01,133 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 10:45:01,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:01,772 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 10:45:01,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:01,772 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 10:45:01,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:01,777 INFO L225 Difference]: With dead ends: 92 [2020-07-21 10:45:01,778 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 10:45:01,784 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 [2020-07-21 10:45:01,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 10:45:01,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 10:45:01,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:01,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:01,805 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 10:45:01,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:01,808 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:01,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:01,808 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:01,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-21 10:45:01,815 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:01,815 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 84, 50, 50, 50, 50, 50, 50, 50, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:02,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:02,030 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:02,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:02,030 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-21 10:45:02,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:02,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229961567] [2020-07-21 10:45:02,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:02,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:02,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1549 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:45:02,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:02,687 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3626 refuted. 0 times theorem prover too weak. 24423 trivial. 0 not checked. [2020-07-21 10:45:02,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:05,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:05,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,921 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3703 refuted. 0 times theorem prover too weak. 24346 trivial. 0 not checked. [2020-07-21 10:45:07,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229961567] [2020-07-21 10:45:07,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:07,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:45:07,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147867116] [2020-07-21 10:45:07,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:45:07,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:07,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:45:07,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:45:07,928 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 10:45:08,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:08,600 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 10:45:08,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:45:08,604 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-21 10:45:08,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:08,608 INFO L225 Difference]: With dead ends: 97 [2020-07-21 10:45:08,608 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 10:45:08,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1401 GetRequests, 1358 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:45:08,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 10:45:08,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 10:45:08,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:45:08,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:45:08,622 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-21 10:45:08,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:08,624 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:45:08,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:45:08,624 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:45:08,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 10:45:08,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:08,654 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:08,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:08,867 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:08,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:08,868 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-21 10:45:08,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:08,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189946241] [2020-07-21 10:45:08,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:09,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:09,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 4352 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:09,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:11,158 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11715 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 10:45:11,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:16,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:19,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:21,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:21,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:21,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:22,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:23,805 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11807 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 10:45:23,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189946241] [2020-07-21 10:45:23,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:23,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:45:23,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846038491] [2020-07-21 10:45:23,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:45:23,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:23,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:45:23,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:23,809 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 10:45:24,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:24,223 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 10:45:24,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:45:24,224 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 10:45:24,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:24,230 INFO L225 Difference]: With dead ends: 102 [2020-07-21 10:45:24,231 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 10:45:24,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:45:24,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 10:45:24,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 10:45:24,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:45:24,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:45:24,247 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 10:45:24,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:24,249 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:45:24,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:45:24,250 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:45:24,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-21 10:45:24,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:24,266 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 164, 98, 98, 98, 98, 98, 98, 98, 66, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:24,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:24,481 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:24,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:24,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-21 10:45:24,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:24,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553281083] [2020-07-21 10:45:24,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:25,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:25,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 3005 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:45:25,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:25,840 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8306 refuted. 0 times theorem prover too weak. 100095 trivial. 0 not checked. [2020-07-21 10:45:25,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:30,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:32,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:32,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,287 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8406 refuted. 0 times theorem prover too weak. 99995 trivial. 0 not checked. [2020-07-21 10:45:35,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553281083] [2020-07-21 10:45:35,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:35,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:45:35,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444392984] [2020-07-21 10:45:35,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:45:35,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:35,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:45:35,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:45:35,291 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 10:45:35,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:35,873 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 10:45:35,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:45:35,874 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-21 10:45:35,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:35,879 INFO L225 Difference]: With dead ends: 107 [2020-07-21 10:45:35,879 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 10:45:35,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:45:35,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 10:45:35,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 10:45:35,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:45:35,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:45:35,895 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-21 10:45:35,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:35,896 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:45:35,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:45:35,897 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:45:35,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-21 10:45:35,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:35,947 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:36,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:36,152 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:36,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:36,154 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-21 10:45:36,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:36,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551567442] [2020-07-21 10:45:36,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:37,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:37,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 6092 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:45:37,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:40,470 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-21 10:45:40,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:48,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:53,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:55,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:56,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:56,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:57,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:57,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:57,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:57,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:57,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:58,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:58,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:00,677 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-21 10:46:00,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551567442] [2020-07-21 10:46:00,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:00,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:00,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983100769] [2020-07-21 10:46:00,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:00,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:00,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:00,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:00,710 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 10:46:01,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:01,595 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 10:46:01,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:01,596 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-21 10:46:01,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:01,603 INFO L225 Difference]: With dead ends: 112 [2020-07-21 10:46:01,604 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 10:46:01,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:01,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 10:46:01,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 10:46:01,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:01,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:01,622 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-21 10:46:01,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:01,624 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:01,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:01,624 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:01,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2865 [2020-07-21 10:46:01,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:01,674 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 343, 209, 209, 209, 209, 209, 209, 209, 134, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:01,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:01,875 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:01,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:01,877 INFO L82 PathProgramCache]: Analyzing trace with hash 565204626, now seen corresponding path program 9 times [2020-07-21 10:46:01,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:01,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587631300] [2020-07-21 10:46:01,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:02,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:02,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 6360 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:46:02,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:05,601 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20214 refuted. 0 times theorem prover too weak. 472883 trivial. 0 not checked. [2020-07-21 10:46:05,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:14,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:19,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:21,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:21,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:22,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:23,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:23,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:23,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:23,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:23,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:24,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:24,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20340 refuted. 0 times theorem prover too weak. 472757 trivial. 0 not checked. [2020-07-21 10:46:26,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587631300] [2020-07-21 10:46:26,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:26,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:46:26,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791059791] [2020-07-21 10:46:26,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:46:26,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:26,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:46:26,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:46:26,660 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 10:46:27,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:27,576 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 10:46:27,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:46:27,577 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2864 [2020-07-21 10:46:27,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:27,584 INFO L225 Difference]: With dead ends: 117 [2020-07-21 10:46:27,584 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 10:46:27,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5737 GetRequests, 5684 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:46:27,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 10:46:27,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 10:46:27,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:46:27,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:46:27,604 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2864 [2020-07-21 10:46:27,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:27,606 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:46:27,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:46:27,606 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:46:27,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 10:46:27,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:27,697 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:27,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:27,898 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:27,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:27,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 10:46:27,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:27,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98169838] [2020-07-21 10:46:27,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:29,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:29,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 8876 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:46:29,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:34,625 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 10:46:34,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:49,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:49,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:56,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:59,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:00,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:02,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:02,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:02,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:03,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:03,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:03,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:03,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:09,193 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 10:47:09,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98169838] [2020-07-21 10:47:09,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:47:09,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:47:09,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470775650] [2020-07-21 10:47:09,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:47:09,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:47:09,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:47:09,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:47:09,198 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 10:47:10,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:47:10,437 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 10:47:10,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:47:10,439 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 10:47:10,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:47:10,449 INFO L225 Difference]: With dead ends: 122 [2020-07-21 10:47:10,449 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 10:47:10,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:47:10,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 10:47:10,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 10:47:10,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:47:10,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:47:10,476 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 10:47:10,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:47:10,480 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:47:10,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:47:10,481 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:47:10,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4941 [2020-07-21 10:47:10,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:47:10,688 INFO L422 BasicCegarLoop]: trace histogram [727, 727, 571, 363, 363, 363, 363, 363, 363, 363, 208, 156, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:47:10,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:10,904 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:47:10,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:47:10,905 INFO L82 PathProgramCache]: Analyzing trace with hash 853155490, now seen corresponding path program 10 times [2020-07-21 10:47:10,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:47:10,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215637431] [2020-07-21 10:47:10,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:12,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:47:12,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 10974 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:47:12,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:47:20,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1481151 backedges. 5109 proven. 39044 refuted. 0 times theorem prover too weak. 1436998 trivial. 0 not checked. [2020-07-21 10:47:20,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:47:36,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:46,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:46,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:51,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:51,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:53,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:53,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:55,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:55,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:55,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:55,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:56,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:48:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1481151 backedges. 5109 proven. 39199 refuted. 0 times theorem prover too weak. 1436843 trivial. 0 not checked. [2020-07-21 10:48:04,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215637431] [2020-07-21 10:48:04,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:48:04,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:48:04,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175340256] [2020-07-21 10:48:04,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:48:04,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:48:04,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:48:04,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:48:04,216 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 10:48:05,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:48:05,733 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 10:48:05,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:48:05,736 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4940 [2020-07-21 10:48:05,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:48:05,745 INFO L225 Difference]: With dead ends: 127 [2020-07-21 10:48:05,746 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 10:48:05,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9890 GetRequests, 9832 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:48:05,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 10:48:05,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 10:48:05,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:48:05,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:48:05,768 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4940 [2020-07-21 10:48:05,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:48:05,772 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:48:05,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:48:05,772 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:48:06,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7879 [2020-07-21 10:48:06,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:48:06,084 INFO L422 BasicCegarLoop]: trace histogram [1211, 1211, 606, 605, 605, 605, 605, 605, 605, 605, 605, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:48:06,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:06,293 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:48:06,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:48:06,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1905470022, now seen corresponding path program 11 times [2020-07-21 10:48:06,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:48:06,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443134374] [2020-07-21 10:48:06,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:48:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:48:09,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 17576 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:48:09,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:48:28,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8359 proven. 67772 refuted. 0 times theorem prover too weak. 3768039 trivial. 0 not checked. [2020-07-21 10:48:28,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:49:03,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:14,990 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 10:49:15,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:24,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:24,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:29,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:29,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:33,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:35,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:35,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:36,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:36,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:37,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:37,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:37,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:37,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:37,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:57,448 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8359 proven. 67948 refuted. 0 times theorem prover too weak. 3767863 trivial. 0 not checked. [2020-07-21 10:49:57,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443134374] [2020-07-21 10:49:57,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:49:57,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:49:57,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949528386] [2020-07-21 10:49:57,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:49:57,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:49:57,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:49:57,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:49:57,456 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 10:49:59,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:49:59,390 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 10:49:59,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:49:59,393 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7878 [2020-07-21 10:49:59,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:49:59,403 INFO L225 Difference]: With dead ends: 132 [2020-07-21 10:49:59,404 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 10:49:59,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15768 GetRequests, 15705 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:49:59,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 10:49:59,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 10:49:59,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:49:59,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:49:59,430 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7878 [2020-07-21 10:49:59,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:49:59,435 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:49:59,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:49:59,436 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:49:59,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6796 [2020-07-21 10:49:59,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:49:59,681 INFO L422 BasicCegarLoop]: trace histogram [989, 989, 854, 494, 494, 494, 494, 494, 494, 494, 360, 135, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:49:59,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:49:59,883 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:49:59,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:49:59,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1723860737, now seen corresponding path program 11 times [2020-07-21 10:49:59,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:49:59,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537461447] [2020-07-21 10:49:59,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:50:02,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:50:02,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 15077 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:50:02,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:50:16,960 INFO L134 CoverageAnalysis]: Checked inductivity of 2805579 backedges. 7230 proven. 59595 refuted. 0 times theorem prover too weak. 2738754 trivial. 0 not checked. [2020-07-21 10:50:16,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:50:52,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:52,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:04,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:14,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:14,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:18,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:18,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:22,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:22,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:23,690 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 10:51:23,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:23,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:24,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:25,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2805579 backedges. 7230 proven. 59782 refuted. 0 times theorem prover too weak. 2738567 trivial. 0 not checked. [2020-07-21 10:51:43,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537461447] [2020-07-21 10:51:43,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:51:43,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:51:43,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653913022] [2020-07-21 10:51:43,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:51:43,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:51:43,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:51:43,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:51:43,846 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 10:51:44,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:51:44,743 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 10:51:44,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:51:44,745 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6795 [2020-07-21 10:51:44,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:51:44,756 INFO L225 Difference]: With dead ends: 137 [2020-07-21 10:51:44,757 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 10:51:44,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13601 GetRequests, 13538 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:51:44,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 10:51:44,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 10:51:44,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:51:44,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:51:44,787 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6795 [2020-07-21 10:51:44,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:51:44,791 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:51:44,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:51:44,791 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:51:47,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14041 [2020-07-21 10:51:47,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:51:47,279 INFO L422 BasicCegarLoop]: trace histogram [2159, 2159, 1080, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:51:47,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:47,481 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:51:47,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:51:47,485 INFO L82 PathProgramCache]: Analyzing trace with hash 984008908, now seen corresponding path program 12 times [2020-07-21 10:51:47,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:51:47,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159124300] [2020-07-21 10:51:47,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:52,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:51:52,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 31322 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:51:52,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:52:54,825 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13324 proven. 134744 refuted. 0 times theorem prover too weak. 12078081 trivial. 0 not checked. [2020-07-21 10:52:54,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:53:01,325 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 10:53:01,432 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 10:53:06,231 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:53:06,344 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 10:53:06,460 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:53:06,576 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 10:53:13,464 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:53:13,578 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 10:53:13,684 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 10:53:59,826 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:54:23,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:07,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:07,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:27,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:27,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:37,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:46,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:50,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:52,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:53,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:53,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:54,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:54,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:54,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:55,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:56:54,986 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13324 proven. 134954 refuted. 0 times theorem prover too weak. 12077871 trivial. 0 not checked. [2020-07-21 10:56:54,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159124300] [2020-07-21 10:56:54,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:56:54,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 10:56:54,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899591195] [2020-07-21 10:56:54,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 10:56:54,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:56:54,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 10:56:54,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 10:56:54,994 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 10:56:58,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:56:58,653 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 10:56:58,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 10:56:58,656 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 14040 [2020-07-21 10:56:58,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:56:58,669 INFO L225 Difference]: With dead ends: 142 [2020-07-21 10:56:58,669 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 10:56:58,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28093 GetRequests, 28025 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 10:56:58,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 10:56:58,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 10:56:58,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 10:56:58,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 10:56:58,702 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 14040 [2020-07-21 10:56:58,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:56:58,710 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 10:56:58,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 10:56:58,710 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 10:57:00,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13396 [2020-07-21 10:57:00,170 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:57:00,174 INFO L422 BasicCegarLoop]: trace histogram [1973, 1973, 1550, 986, 986, 986, 986, 986, 986, 986, 564, 423, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:57:00,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:57:00,393 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:57:00,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:57:00,398 INFO L82 PathProgramCache]: Analyzing trace with hash 733115231, now seen corresponding path program 12 times [2020-07-21 10:57:00,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:57:00,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518986574] [2020-07-21 10:57:00,399 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 [2020-07-21 10:57:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:57:05,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 29753 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:57:05,479 INFO L286 TraceCheckSpWp]: Computing forward predicates...