/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:00:21,282 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:00:21,286 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:00:21,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:00:21,317 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:00:21,321 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:00:21,325 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:00:21,339 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:00:21,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:00:21,350 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:00:21,352 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:00:21,356 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:00:21,357 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:00:21,362 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:00:21,366 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:00:21,369 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:00:21,371 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:00:21,373 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:00:21,375 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:00:21,383 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:00:21,392 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:00:21,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:00:21,399 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:00:21,400 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:00:21,404 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:00:21,421 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:00:21,423 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:00:21,425 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:00:21,426 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:00:21,464 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:00:21,465 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:00:21,469 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:00:21,470 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:00:21,470 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:00:21,470 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:00:21,470 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:00:21,471 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:00:21,471 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:00:21,471 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:00:21,472 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:00:21,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:00:21,473 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:00:21,474 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:00:21,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:00:21,474 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:00:21,474 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:00:21,475 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:00:21,475 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:00:21,475 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:00:21,475 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:00:21,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:21,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:00:21,476 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:00:21,476 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:00:21,476 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:00:21,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:21,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:00:21,477 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:00:21,477 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:00:21,841 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:00:21,867 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:00:21,876 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:00:21,878 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:00:21,879 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:00:21,881 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 11:00:21,978 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57b0b7e46/6a899b3b64944d4a8bb546596224aeee/FLAG3ef7c4816 [2020-07-20 11:00:22,642 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:00:22,643 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 11:00:22,656 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57b0b7e46/6a899b3b64944d4a8bb546596224aeee/FLAG3ef7c4816 [2020-07-20 11:00:22,916 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/57b0b7e46/6a899b3b64944d4a8bb546596224aeee [2020-07-20 11:00:22,929 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:00:22,933 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:00:22,935 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:22,935 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:00:22,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:00:22,943 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:22" (1/1) ... [2020-07-20 11:00:22,948 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56cdb574 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:22, skipping insertion in model container [2020-07-20 11:00:22,948 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:22" (1/1) ... [2020-07-20 11:00:22,961 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:00:22,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:00:23,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:23,243 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:00:23,261 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:00:23,278 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:00:23,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23 WrapperNode [2020-07-20 11:00:23,279 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:00:23,280 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:00:23,280 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:00:23,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:00:23,296 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,297 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,304 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,304 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,310 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,312 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... [2020-07-20 11:00:23,317 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:00:23,318 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:00:23,318 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:00:23,318 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:00:23,321 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:00:23,546 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:00:23,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:00:23,547 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 11:00:23,547 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 11:00:23,547 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:00:23,547 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:00:23,547 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:00:23,548 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 11:00:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 11:00:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:00:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:00:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:00:23,858 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:00:23,858 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:00:23,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:23 BoogieIcfgContainer [2020-07-20 11:00:23,863 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:00:23,864 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:00:23,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:00:23,871 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:00:23,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:22" (1/3) ... [2020-07-20 11:00:23,875 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d1dc354 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:23, skipping insertion in model container [2020-07-20 11:00:23,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:23" (2/3) ... [2020-07-20 11:00:23,876 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d1dc354 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:23, skipping insertion in model container [2020-07-20 11:00:23,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:23" (3/3) ... [2020-07-20 11:00:23,879 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2020-07-20 11:00:23,910 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:00:23,928 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:00:23,962 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:00:24,006 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:00:24,006 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:00:24,006 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:00:24,007 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:00:24,007 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:00:24,007 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:00:24,007 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:00:24,007 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:00:24,040 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:00:24,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:00:24,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,053 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,054 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 11:00:24,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150901749] [2020-07-20 11:00:24,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:24,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:24,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:24,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150901749] [2020-07-20 11:00:24,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:24,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:24,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828931407] [2020-07-20 11:00:24,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:24,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:24,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:24,344 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 11:00:24,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:24,529 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 11:00:24,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:24,532 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:00:24,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:24,551 INFO L225 Difference]: With dead ends: 44 [2020-07-20 11:00:24,551 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:00:24,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:24,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:00:24,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 11:00:24,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:00:24,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:00:24,621 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 11:00:24,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:24,622 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:00:24,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:24,622 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:00:24,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:00:24,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:24,626 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:24,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,841 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:24,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:24,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 11:00:24,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:24,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542441319] [2020-07-20 11:00:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:24,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:24,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:00:24,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:24,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:00:24,942 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:00:24,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542441319] [2020-07-20 11:00:24,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:00:24,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:00:24,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704123301] [2020-07-20 11:00:24,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:00:24,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:24,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:00:24,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:00:24,947 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 11:00:25,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:25,061 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 11:00:25,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:00:25,062 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 11:00:25,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:25,065 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:00:25,065 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 11:00:25,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:00:25,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 11:00:25,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 11:00:25,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:00:25,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 11:00:25,094 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 11:00:25,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:25,094 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 11:00:25,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:00:25,095 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 11:00:25,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:00:25,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:25,097 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:25,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,313 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:25,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:25,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 11:00:25,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:25,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67104596] [2020-07-20 11:00:25,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:25,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:25,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:25,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:25,461 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:00:25,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:25,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:25,807 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:00:25,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67104596] [2020-07-20 11:00:25,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:25,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:00:25,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10617721] [2020-07-20 11:00:25,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:00:25,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:25,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:00:25,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:00:25,812 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 11:00:26,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,037 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 11:00:26,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:26,039 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 11:00:26,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,041 INFO L225 Difference]: With dead ends: 41 [2020-07-20 11:00:26,042 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:00:26,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:26,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:00:26,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 11:00:26,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:00:26,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:00:26,056 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 11:00:26,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:26,057 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:00:26,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:00:26,057 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:00:26,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:00:26,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:26,060 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:26,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,274 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:26,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:26,275 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 11:00:26,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:26,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924962512] [2020-07-20 11:00:26,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:26,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:26,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:00:26,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:26,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:00:26,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:26,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:26,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:00:26,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924962512] [2020-07-20 11:00:26,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:26,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 11:00:26,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546903892] [2020-07-20 11:00:26,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 11:00:26,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:26,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 11:00:26,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:00:26,749 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 11:00:26,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:26,971 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 11:00:26,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:00:26,972 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 11:00:26,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:26,977 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:00:26,977 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 11:00:26,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:26,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 11:00:27,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 11:00:27,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:00:27,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 11:00:27,014 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 11:00:27,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:27,015 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 11:00:27,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 11:00:27,018 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 11:00:27,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:00:27,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:27,021 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:27,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,237 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:27,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:27,237 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 11:00:27,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:27,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112856513] [2020-07-20 11:00:27,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:27,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:27,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:27,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:27,385 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 11:00:27,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:27,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:27,852 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:27,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112856513] [2020-07-20 11:00:27,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:27,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:00:27,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38075845] [2020-07-20 11:00:27,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:00:27,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:27,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:00:27,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:27,858 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 11:00:28,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:28,133 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 11:00:28,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:28,135 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 11:00:28,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:28,137 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:00:28,138 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 11:00:28,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:28,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 11:00:28,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 11:00:28,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:00:28,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:00:28,152 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 11:00:28,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:28,153 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:00:28,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:00:28,153 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:00:28,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 11:00:28,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:28,156 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:28,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:28,359 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:28,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:28,360 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 11:00:28,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:28,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548001701] [2020-07-20 11:00:28,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:28,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:28,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:00:28,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:28,479 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 11:00:28,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:28,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:00:28,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548001701] [2020-07-20 11:00:28,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:28,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 11:00:28,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955503046] [2020-07-20 11:00:28,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:00:28,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:28,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:00:28,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:00:28,885 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 11:00:29,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:29,180 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 11:00:29,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:00:29,181 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 11:00:29,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:29,186 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:00:29,186 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 11:00:29,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:00:29,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 11:00:29,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 11:00:29,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 11:00:29,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 11:00:29,229 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 11:00:29,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:29,230 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 11:00:29,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:00:29,230 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 11:00:29,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 11:00:29,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:29,238 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:29,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,455 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:29,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:29,456 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 11:00:29,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:29,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708857041] [2020-07-20 11:00:29,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:29,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:29,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:29,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:29,610 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 11:00:29,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:30,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:30,298 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:00:30,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708857041] [2020-07-20 11:00:30,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:30,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:00:30,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127088498] [2020-07-20 11:00:30,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:00:30,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:30,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:00:30,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:30,302 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 11:00:30,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:30,584 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 11:00:30,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:30,585 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 11:00:30,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:30,587 INFO L225 Difference]: With dead ends: 61 [2020-07-20 11:00:30,588 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 11:00:30,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:30,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 11:00:30,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 11:00:30,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:00:30,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:00:30,602 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 11:00:30,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:30,603 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:00:30,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:00:30,603 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:00:30,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 11:00:30,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:30,606 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:30,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:30,816 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:30,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:30,817 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 11:00:30,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:30,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751911747] [2020-07-20 11:00:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:30,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:30,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:00:30,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:30,966 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 11:00:30,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:31,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:31,608 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:00:31,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751911747] [2020-07-20 11:00:31,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:31,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 11:00:31,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315015600] [2020-07-20 11:00:31,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:00:31,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:31,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:00:31,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:00:31,612 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 11:00:31,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:31,885 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 11:00:31,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:00:31,886 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 11:00:31,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:31,889 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:00:31,890 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 11:00:31,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:31,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 11:00:31,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 11:00:31,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:00:31,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 11:00:31,905 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 11:00:31,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:31,906 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 11:00:31,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:00:31,906 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 11:00:31,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 11:00:31,909 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:31,909 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:32,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,125 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:32,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:32,126 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 11:00:32,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:32,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1886743051] [2020-07-20 11:00:32,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:32,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:32,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:32,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:32,300 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 11:00:32,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:33,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:33,465 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 11:00:33,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1886743051] [2020-07-20 11:00:33,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:33,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 11:00:33,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569205744] [2020-07-20 11:00:33,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:00:33,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:33,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:00:33,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:00:33,469 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 11:00:33,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:33,838 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 11:00:33,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:33,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 11:00:33,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:33,841 INFO L225 Difference]: With dead ends: 71 [2020-07-20 11:00:33,841 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 11:00:33,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:33,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 11:00:33,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 11:00:33,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 11:00:33,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 11:00:33,858 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 11:00:33,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:33,859 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 11:00:33,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:00:33,860 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 11:00:33,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 11:00:33,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:33,862 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:34,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:34,078 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:34,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:34,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 11:00:34,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:34,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63204663] [2020-07-20 11:00:34,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:34,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:34,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:00:34,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:34,267 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 11:00:34,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:34,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:35,410 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 11:00:35,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63204663] [2020-07-20 11:00:35,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:35,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 11:00:35,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303906192] [2020-07-20 11:00:35,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:00:35,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:35,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:00:35,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:00:35,418 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 11:00:35,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:35,750 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 11:00:35,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:00:35,751 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 11:00:35,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:35,755 INFO L225 Difference]: With dead ends: 76 [2020-07-20 11:00:35,755 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 11:00:35,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:00:35,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 11:00:35,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 11:00:35,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 11:00:35,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 11:00:35,790 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 11:00:35,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:35,794 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 11:00:35,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:00:35,795 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 11:00:35,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 11:00:35,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:35,800 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:36,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,002 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:36,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:36,003 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 11:00:36,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:36,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098400694] [2020-07-20 11:00:36,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:36,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:36,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:36,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:36,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 11:00:36,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:37,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:37,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:38,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 11:00:38,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098400694] [2020-07-20 11:00:38,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:38,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 11:00:38,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649590449] [2020-07-20 11:00:38,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:00:38,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:38,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:00:38,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:38,350 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 11:00:38,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:38,709 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 11:00:38,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:38,710 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 11:00:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:38,714 INFO L225 Difference]: With dead ends: 81 [2020-07-20 11:00:38,714 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 11:00:38,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:38,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 11:00:38,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 11:00:38,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 11:00:38,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 11:00:38,731 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 11:00:38,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:38,732 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 11:00:38,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:00:38,732 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 11:00:38,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 11:00:38,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:38,735 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:38,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:38,946 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:38,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:38,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 11:00:38,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:38,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241080078] [2020-07-20 11:00:38,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:39,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:39,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:00:39,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:39,156 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 11:00:39,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:40,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:40,885 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 11:00:40,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241080078] [2020-07-20 11:00:40,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:40,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 11:00:40,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580766908] [2020-07-20 11:00:40,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 11:00:40,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:40,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 11:00:40,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:00:40,891 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 11:00:41,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:41,320 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 11:00:41,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:00:41,327 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 11:00:41,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:41,331 INFO L225 Difference]: With dead ends: 86 [2020-07-20 11:00:41,331 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 11:00:41,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:00:41,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 11:00:41,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 11:00:41,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 11:00:41,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 11:00:41,369 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 11:00:41,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:41,370 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 11:00:41,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:00:41,370 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 11:00:41,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 11:00:41,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:41,376 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:41,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:41,578 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:41,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:41,578 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 11:00:41,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:41,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852664125] [2020-07-20 11:00:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:41,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:41,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:41,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:41,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 11:00:41,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:43,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:43,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:44,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 11:00:44,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852664125] [2020-07-20 11:00:44,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:44,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 11:00:44,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805790470] [2020-07-20 11:00:44,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:00:44,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:44,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:00:44,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:44,627 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 11:00:45,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:45,134 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 11:00:45,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:45,136 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 11:00:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:45,139 INFO L225 Difference]: With dead ends: 91 [2020-07-20 11:00:45,139 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 11:00:45,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:00:45,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 11:00:45,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 11:00:45,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:00:45,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 11:00:45,155 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 11:00:45,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:45,156 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 11:00:45,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:00:45,156 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 11:00:45,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 11:00:45,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:45,160 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:45,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:45,376 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:45,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:45,377 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 11:00:45,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:45,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940985186] [2020-07-20 11:00:45,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:45,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:45,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:00:45,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:45,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 11:00:45,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:47,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:47,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:48,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 11:00:48,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [940985186] [2020-07-20 11:00:48,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:48,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 11:00:48,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795553882] [2020-07-20 11:00:48,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:00:48,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:48,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:00:48,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:00:48,674 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 11:00:49,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:49,156 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 11:00:49,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:00:49,158 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 11:00:49,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:49,161 INFO L225 Difference]: With dead ends: 96 [2020-07-20 11:00:49,162 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 11:00:49,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:00:49,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 11:00:49,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 11:00:49,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:00:49,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 11:00:49,179 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 11:00:49,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:49,180 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 11:00:49,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:00:49,181 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 11:00:49,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 11:00:49,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:49,189 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:49,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,404 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:49,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:49,405 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 11:00:49,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:49,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348662650] [2020-07-20 11:00:49,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:49,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:49,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:49,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:49,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 11:00:49,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:52,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:52,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:53,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:54,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 11:00:54,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348662650] [2020-07-20 11:00:54,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:00:54,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 11:00:54,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494154124] [2020-07-20 11:00:54,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:00:54,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:00:54,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:00:54,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:00:54,566 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 11:00:55,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:00:55,235 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 11:00:55,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:00:55,236 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 11:00:55,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:00:55,244 INFO L225 Difference]: With dead ends: 101 [2020-07-20 11:00:55,244 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 11:00:55,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:00:55,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 11:00:55,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 11:00:55,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 11:00:55,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 11:00:55,275 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 11:00:55,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:00:55,276 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 11:00:55,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:00:55,277 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 11:00:55,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 11:00:55,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:00:55,289 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:00:55,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:55,503 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:00:55,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:00:55,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 11:00:55,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:00:55,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593877358] [2020-07-20 11:00:55,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:00:55,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:00:55,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:00:55,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:00:56,100 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 11:00:56,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:00:58,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:58,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:00:59,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:00,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:00,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:01,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 11:01:01,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593877358] [2020-07-20 11:01:01,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:01,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 11:01:01,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909562245] [2020-07-20 11:01:01,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:01:01,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:01,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:01:01,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:01:01,371 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 11:01:02,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:02,092 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 11:01:02,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:02,093 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 11:01:02,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:02,097 INFO L225 Difference]: With dead ends: 106 [2020-07-20 11:01:02,098 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 11:01:02,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:01:02,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 11:01:02,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 11:01:02,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 11:01:02,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 11:01:02,135 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 11:01:02,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:02,138 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 11:01:02,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:01:02,138 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 11:01:02,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 11:01:02,151 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:02,151 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:02,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:02,367 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:02,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:02,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 11:01:02,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:02,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718072768] [2020-07-20 11:01:02,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:02,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:02,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:02,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:03,425 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 11:01:03,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:08,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:09,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:10,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:11,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:12,779 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 11:01:12,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718072768] [2020-07-20 11:01:12,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:12,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 11:01:12,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174918882] [2020-07-20 11:01:12,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:01:12,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:12,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:01:12,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:01:12,783 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 11:01:13,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:13,576 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 11:01:13,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:13,577 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 11:01:13,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:13,581 INFO L225 Difference]: With dead ends: 111 [2020-07-20 11:01:13,581 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 11:01:13,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:01:13,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 11:01:13,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 11:01:13,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 11:01:13,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 11:01:13,599 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 11:01:13,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:13,601 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 11:01:13,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:01:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 11:01:13,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 11:01:13,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:13,605 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:13,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:13,821 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:13,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:13,822 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 11:01:13,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:13,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276166578] [2020-07-20 11:01:13,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:14,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:14,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:14,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:14,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 11:01:14,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:18,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:19,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:19,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:20,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:21,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:22,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 11:01:22,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276166578] [2020-07-20 11:01:22,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:22,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:01:22,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795627513] [2020-07-20 11:01:22,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:22,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:22,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:22,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:22,045 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 11:01:23,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:23,157 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 11:01:23,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:23,158 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 11:01:23,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:23,162 INFO L225 Difference]: With dead ends: 116 [2020-07-20 11:01:23,163 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 11:01:23,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:23,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 11:01:23,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 11:01:23,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 11:01:23,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 11:01:23,184 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 11:01:23,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:23,186 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 11:01:23,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:23,186 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 11:01:23,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 11:01:23,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:23,196 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:23,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:23,412 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:23,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:23,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 11:01:23,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:23,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229478304] [2020-07-20 11:01:23,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:23,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:23,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 1509 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:01:23,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:24,513 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 11:01:24,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:26,358 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:01:29,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:29,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:31,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:33,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:34,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:35,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:36,300 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 11:01:36,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229478304] [2020-07-20 11:01:36,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:36,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:01:36,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991734600] [2020-07-20 11:01:36,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:01:36,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:36,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:01:36,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:01:36,319 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 11:01:37,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:37,200 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 11:01:37,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:01:37,202 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 11:01:37,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:37,206 INFO L225 Difference]: With dead ends: 121 [2020-07-20 11:01:37,207 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 11:01:37,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:01:37,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 11:01:37,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 11:01:37,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 11:01:37,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 11:01:37,225 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 11:01:37,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:37,226 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 11:01:37,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:01:37,226 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 11:01:37,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 11:01:37,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:37,235 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:37,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:37,450 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:37,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:37,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 11:01:37,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:37,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987513377] [2020-07-20 11:01:37,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:37,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:38,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 1677 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:38,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:38,517 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 11:01:38,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:43,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:43,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:45,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:46,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:46,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:47,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:48,136 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 11:01:48,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987513377] [2020-07-20 11:01:48,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:48,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:01:48,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790753354] [2020-07-20 11:01:48,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:01:48,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:48,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:01:48,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:01:48,139 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 11:01:48,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:48,803 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 11:01:48,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:01:48,805 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 11:01:48,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:48,809 INFO L225 Difference]: With dead ends: 159 [2020-07-20 11:01:48,809 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 11:01:48,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:01:48,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 11:01:48,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 11:01:48,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 11:01:48,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 11:01:48,829 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 11:01:48,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:48,830 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 11:01:48,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:01:48,830 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 11:01:48,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 11:01:48,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:48,838 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:49,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:49,051 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:49,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:49,051 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 11:01:49,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:49,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534755808] [2020-07-20 11:01:49,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:49,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:49,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 1699 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:01:49,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:49,916 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 11:01:49,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:01:53,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:53,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:54,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:55,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:56,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:56,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:56,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:01:56,360 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 11:01:56,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534755808] [2020-07-20 11:01:56,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:01:56,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:01:56,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127520099] [2020-07-20 11:01:56,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:01:56,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:01:56,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:01:56,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:01:56,363 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 11:01:56,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:01:56,913 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 11:01:56,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:01:56,914 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 11:01:56,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:01:56,918 INFO L225 Difference]: With dead ends: 179 [2020-07-20 11:01:56,918 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 11:01:56,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:01:56,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 11:01:56,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 11:01:56,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 11:01:56,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 11:01:56,942 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 11:01:56,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:01:56,943 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 11:01:56,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:01:56,943 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 11:01:56,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 11:01:56,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:01:56,955 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:01:57,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:57,170 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:01:57,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:01:57,171 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 11:01:57,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:01:57,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909319514] [2020-07-20 11:01:57,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:01:57,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:01:57,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 2399 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:01:57,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:01:58,433 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 11:01:58,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:02,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:05,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:05,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:06,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:06,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:06,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:06,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:07,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:08,302 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 11:02:08,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909319514] [2020-07-20 11:02:08,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:08,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:02:08,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507210739] [2020-07-20 11:02:08,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:02:08,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:08,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:02:08,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:02:08,305 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 11:02:08,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:08,966 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 11:02:08,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:02:08,969 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 11:02:08,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:08,974 INFO L225 Difference]: With dead ends: 156 [2020-07-20 11:02:08,974 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 11:02:08,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:02:08,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 11:02:08,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 11:02:08,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 11:02:08,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 11:02:08,993 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 11:02:08,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:08,994 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 11:02:08,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:02:08,994 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 11:02:09,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 11:02:09,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:09,004 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:09,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:09,219 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:09,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:09,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 11:02:09,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:09,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384958530] [2020-07-20 11:02:09,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:09,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:09,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 2177 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:02:09,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:10,837 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 11:02:10,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:14,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:14,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:15,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:15,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:16,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:16,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:17,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:18,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:18,502 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 11:02:18,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384958530] [2020-07-20 11:02:18,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:18,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:02:18,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025174752] [2020-07-20 11:02:18,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:02:18,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:18,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:02:18,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:02:18,505 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 11:02:19,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:19,060 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 11:02:19,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:02:19,061 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 11:02:19,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:19,065 INFO L225 Difference]: With dead ends: 174 [2020-07-20 11:02:19,065 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 11:02:19,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:02:19,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 11:02:19,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 11:02:19,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 11:02:19,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 11:02:19,089 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 11:02:19,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:19,090 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 11:02:19,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:02:19,091 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 11:02:19,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 11:02:19,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:19,105 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:19,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:19,321 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:19,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:19,322 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-20 11:02:19,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:19,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524328486] [2020-07-20 11:02:19,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:20,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:20,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 2521 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:02:20,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:20,736 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3598 refuted. 0 times theorem prover too weak. 33872 trivial. 0 not checked. [2020-07-20 11:02:20,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:26,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:28,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:30,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:31,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:32,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:33,065 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-20 11:02:33,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524328486] [2020-07-20 11:02:33,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:33,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:02:33,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749246745] [2020-07-20 11:02:33,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:33,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:33,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:33,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:33,067 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 11:02:33,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:33,994 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 11:02:33,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:33,995 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-20 11:02:33,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:34,001 INFO L225 Difference]: With dead ends: 263 [2020-07-20 11:02:34,001 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 11:02:34,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:34,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 11:02:34,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 11:02:34,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 11:02:34,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 11:02:34,034 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-20 11:02:34,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:34,035 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 11:02:34,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:34,035 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 11:02:34,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2020-07-20 11:02:34,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:34,049 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 63, 63, 58, 53, 42, 42, 42, 42, 42, 42, 42, 31, 31, 31, 31, 31, 31, 31, 31, 22, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:34,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:34,264 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:34,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:34,266 INFO L82 PathProgramCache]: Analyzing trace with hash 873446842, now seen corresponding path program 4 times [2020-07-20 11:02:34,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:34,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883446914] [2020-07-20 11:02:34,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:34,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:34,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 2223 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:02:34,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 639 proven. 3185 refuted. 0 times theorem prover too weak. 26267 trivial. 0 not checked. [2020-07-20 11:02:35,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:41,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:41,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:43,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:44,398 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:02:44,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:45,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:46,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:47,251 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 643 proven. 3233 refuted. 0 times theorem prover too weak. 26215 trivial. 0 not checked. [2020-07-20 11:02:47,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883446914] [2020-07-20 11:02:47,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:02:47,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:02:47,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919604570] [2020-07-20 11:02:47,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:02:47,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:02:47,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:02:47,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:02:47,254 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-20 11:02:48,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:02:48,292 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-20 11:02:48,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:02:48,294 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1000 [2020-07-20 11:02:48,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:02:48,302 INFO L225 Difference]: With dead ends: 385 [2020-07-20 11:02:48,303 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 11:02:48,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1955 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:02:48,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 11:02:48,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-20 11:02:48,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 11:02:48,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-20 11:02:48,345 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1000 [2020-07-20 11:02:48,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:02:48,347 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-20 11:02:48,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:02:48,347 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-20 11:02:48,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 982 [2020-07-20 11:02:48,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:02:48,369 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 70, 70, 53, 51, 37, 37, 37, 37, 37, 37, 37, 35, 35, 35, 35, 35, 35, 35, 22, 19, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:02:48,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:48,585 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:02:48,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:02:48,586 INFO L82 PathProgramCache]: Analyzing trace with hash 401393431, now seen corresponding path program 5 times [2020-07-20 11:02:48,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:02:48,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814575799] [2020-07-20 11:02:48,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:02:49,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:02:49,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 2182 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:02:49,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:02:49,949 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 601 proven. 2717 refuted. 0 times theorem prover too weak. 25139 trivial. 0 not checked. [2020-07-20 11:02:49,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:02:54,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:56,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:56,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:58,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:02:59,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:00,352 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 603 proven. 2755 refuted. 0 times theorem prover too weak. 25099 trivial. 0 not checked. [2020-07-20 11:03:00,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814575799] [2020-07-20 11:03:00,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:00,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:03:00,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33962604] [2020-07-20 11:03:00,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:03:00,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:00,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:03:00,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:03:00,355 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-20 11:03:01,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:01,062 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-20 11:03:01,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:03:01,063 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 981 [2020-07-20 11:03:01,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:01,071 INFO L225 Difference]: With dead ends: 263 [2020-07-20 11:03:01,071 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 11:03:01,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1970 GetRequests, 1921 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:03:01,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 11:03:01,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-20 11:03:01,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 11:03:01,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 11:03:01,112 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 981 [2020-07-20 11:03:01,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:01,113 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 11:03:01,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:03:01,113 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 11:03:01,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 938 [2020-07-20 11:03:01,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:01,125 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 67, 67, 58, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 23, 20, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:01,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:01,339 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:01,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:01,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1875152129, now seen corresponding path program 6 times [2020-07-20 11:03:01,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:01,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796792991] [2020-07-20 11:03:01,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:02,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:02,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 2082 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:03:02,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:02,570 INFO L134 CoverageAnalysis]: Checked inductivity of 25874 backedges. 511 proven. 2301 refuted. 0 times theorem prover too weak. 23062 trivial. 0 not checked. [2020-07-20 11:03:02,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:07,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:08,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:08,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:09,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:10,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:11,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:11,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:11,536 INFO L134 CoverageAnalysis]: Checked inductivity of 25874 backedges. 511 proven. 2331 refuted. 0 times theorem prover too weak. 23032 trivial. 0 not checked. [2020-07-20 11:03:11,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796792991] [2020-07-20 11:03:11,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:11,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:03:11,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281533227] [2020-07-20 11:03:11,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:03:11,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:11,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:03:11,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:03:11,539 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 11:03:12,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:12,278 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-20 11:03:12,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:03:12,280 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 937 [2020-07-20 11:03:12,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:12,288 INFO L225 Difference]: With dead ends: 299 [2020-07-20 11:03:12,289 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 11:03:12,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1881 GetRequests, 1837 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:03:12,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 11:03:12,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-20 11:03:12,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 11:03:12,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 11:03:12,338 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 937 [2020-07-20 11:03:12,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:12,339 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 11:03:12,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:03:12,339 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 11:03:12,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1255 [2020-07-20 11:03:12,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:12,363 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 90, 90, 77, 72, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 32, 26, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:12,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:12,578 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:12,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:12,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1042981642, now seen corresponding path program 7 times [2020-07-20 11:03:12,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:12,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711023335] [2020-07-20 11:03:12,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:13,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:13,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 2785 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:03:13,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:14,323 INFO L134 CoverageAnalysis]: Checked inductivity of 46714 backedges. 842 proven. 4012 refuted. 0 times theorem prover too weak. 41860 trivial. 0 not checked. [2020-07-20 11:03:14,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:22,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:22,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:25,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:27,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:28,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:28,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:28,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:29,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:30,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:30,937 INFO L134 CoverageAnalysis]: Checked inductivity of 46714 backedges. 846 proven. 4060 refuted. 0 times theorem prover too weak. 41808 trivial. 0 not checked. [2020-07-20 11:03:30,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711023335] [2020-07-20 11:03:30,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:30,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:03:30,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173354395] [2020-07-20 11:03:30,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:03:30,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:30,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:03:30,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:03:30,940 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 25 states. [2020-07-20 11:03:32,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:32,046 INFO L93 Difference]: Finished difference Result 238 states and 729 transitions. [2020-07-20 11:03:32,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:03:32,047 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1254 [2020-07-20 11:03:32,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:32,053 INFO L225 Difference]: With dead ends: 238 [2020-07-20 11:03:32,053 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 11:03:32,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2517 GetRequests, 2463 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:03:32,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 11:03:32,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 158. [2020-07-20 11:03:32,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 11:03:32,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 384 transitions. [2020-07-20 11:03:32,083 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 384 transitions. Word has length 1254 [2020-07-20 11:03:32,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:32,084 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 384 transitions. [2020-07-20 11:03:32,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:03:32,085 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 384 transitions. [2020-07-20 11:03:32,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1185 [2020-07-20 11:03:32,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:32,104 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 84, 84, 71, 68, 44, 44, 44, 44, 44, 44, 44, 42, 42, 42, 42, 42, 42, 42, 29, 24, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:32,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:32,319 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:32,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:32,320 INFO L82 PathProgramCache]: Analyzing trace with hash 447000985, now seen corresponding path program 8 times [2020-07-20 11:03:32,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:32,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601926328] [2020-07-20 11:03:32,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:33,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:33,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 2630 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:03:33,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:34,037 INFO L134 CoverageAnalysis]: Checked inductivity of 41599 backedges. 736 proven. 2919 refuted. 0 times theorem prover too weak. 37944 trivial. 0 not checked. [2020-07-20 11:03:34,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:39,791 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:03:40,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:42,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:44,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:45,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:45,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:45,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:45,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:45,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:46,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:46,870 INFO L134 CoverageAnalysis]: Checked inductivity of 41599 backedges. 738 proven. 2950 refuted. 0 times theorem prover too weak. 37911 trivial. 0 not checked. [2020-07-20 11:03:46,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601926328] [2020-07-20 11:03:46,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:03:46,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:03:46,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393374709] [2020-07-20 11:03:46,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:03:46,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:03:46,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:03:46,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:03:46,874 INFO L87 Difference]: Start difference. First operand 158 states and 384 transitions. Second operand 21 states. [2020-07-20 11:03:47,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:03:47,742 INFO L93 Difference]: Finished difference Result 259 states and 851 transitions. [2020-07-20 11:03:47,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:03:47,744 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1184 [2020-07-20 11:03:47,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:03:47,750 INFO L225 Difference]: With dead ends: 259 [2020-07-20 11:03:47,750 INFO L226 Difference]: Without dead ends: 245 [2020-07-20 11:03:47,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2375 GetRequests, 2331 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:03:47,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2020-07-20 11:03:47,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 178. [2020-07-20 11:03:47,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2020-07-20 11:03:47,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 483 transitions. [2020-07-20 11:03:47,789 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 483 transitions. Word has length 1184 [2020-07-20 11:03:47,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:03:47,790 INFO L479 AbstractCegarLoop]: Abstraction has 178 states and 483 transitions. [2020-07-20 11:03:47,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:03:47,790 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 483 transitions. [2020-07-20 11:03:47,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 968 [2020-07-20 11:03:47,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:03:47,806 INFO L422 BasicCegarLoop]: trace histogram [72, 72, 71, 71, 51, 51, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 21, 20, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:03:48,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:48,022 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:03:48,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:03:48,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1518821122, now seen corresponding path program 9 times [2020-07-20 11:03:48,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:03:48,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963789313] [2020-07-20 11:03:48,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:03:48,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:03:48,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 2151 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:03:48,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:03:49,529 INFO L134 CoverageAnalysis]: Checked inductivity of 27614 backedges. 597 proven. 2661 refuted. 0 times theorem prover too weak. 24356 trivial. 0 not checked. [2020-07-20 11:03:49,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:03:56,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:59,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:03:59,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:00,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:01,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:01,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:02,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:03,392 INFO L134 CoverageAnalysis]: Checked inductivity of 27614 backedges. 599 proven. 2699 refuted. 0 times theorem prover too weak. 24316 trivial. 0 not checked. [2020-07-20 11:04:03,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963789313] [2020-07-20 11:04:03,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:03,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:04:03,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024348957] [2020-07-20 11:04:03,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:04:03,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:03,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:04:03,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:04:03,395 INFO L87 Difference]: Start difference. First operand 178 states and 483 transitions. Second operand 23 states. [2020-07-20 11:04:04,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:04,388 INFO L93 Difference]: Finished difference Result 267 states and 914 transitions. [2020-07-20 11:04:04,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:04:04,390 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 967 [2020-07-20 11:04:04,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:04,397 INFO L225 Difference]: With dead ends: 267 [2020-07-20 11:04:04,398 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 11:04:04,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1942 GetRequests, 1893 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:04:04,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 11:04:04,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 179. [2020-07-20 11:04:04,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 11:04:04,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 489 transitions. [2020-07-20 11:04:04,445 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 489 transitions. Word has length 967 [2020-07-20 11:04:04,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:04,445 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 489 transitions. [2020-07-20 11:04:04,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:04:04,446 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 489 transitions. [2020-07-20 11:04:04,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1223 [2020-07-20 11:04:04,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:04,470 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 82, 82, 75, 66, 48, 48, 48, 48, 48, 48, 48, 41, 41, 41, 41, 41, 41, 41, 34, 22, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:04,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:04,773 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:04,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:04,775 INFO L82 PathProgramCache]: Analyzing trace with hash -364305948, now seen corresponding path program 10 times [2020-07-20 11:04:04,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:04,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124489851] [2020-07-20 11:04:04,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:05,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:05,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 2715 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:04:05,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:06,747 INFO L134 CoverageAnalysis]: Checked inductivity of 44620 backedges. 680 proven. 3026 refuted. 0 times theorem prover too weak. 40914 trivial. 0 not checked. [2020-07-20 11:04:06,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:07,311 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 11:04:17,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:19,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:21,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:21,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:22,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:22,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:22,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:23,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:23,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:23,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:23,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:23,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:24,549 INFO L134 CoverageAnalysis]: Checked inductivity of 44620 backedges. 680 proven. 3058 refuted. 0 times theorem prover too weak. 40882 trivial. 0 not checked. [2020-07-20 11:04:24,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124489851] [2020-07-20 11:04:24,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:24,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:04:24,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142546464] [2020-07-20 11:04:24,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:04:24,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:24,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:04:24,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:04:24,552 INFO L87 Difference]: Start difference. First operand 179 states and 489 transitions. Second operand 21 states. [2020-07-20 11:04:25,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:25,659 INFO L93 Difference]: Finished difference Result 295 states and 1090 transitions. [2020-07-20 11:04:25,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:04:25,664 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1222 [2020-07-20 11:04:25,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:25,673 INFO L225 Difference]: With dead ends: 295 [2020-07-20 11:04:25,674 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 11:04:25,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2451 GetRequests, 2407 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:04:25,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 11:04:25,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 173. [2020-07-20 11:04:25,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 11:04:25,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 11:04:25,733 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1222 [2020-07-20 11:04:25,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:25,734 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 11:04:25,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:04:25,734 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 11:04:25,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 791 [2020-07-20 11:04:25,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:25,750 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 54, 54, 48, 45, 30, 30, 30, 30, 30, 30, 30, 27, 27, 27, 27, 27, 27, 27, 21, 15, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:25,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:25,965 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:25,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:25,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1965405430, now seen corresponding path program 11 times [2020-07-20 11:04:25,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:25,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048117951] [2020-07-20 11:04:25,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:26,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:26,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 1755 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:04:26,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:27,295 INFO L134 CoverageAnalysis]: Checked inductivity of 18306 backedges. 519 proven. 1574 refuted. 0 times theorem prover too weak. 16213 trivial. 0 not checked. [2020-07-20 11:04:27,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:32,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:32,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:35,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:36,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:37,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:38,185 INFO L134 CoverageAnalysis]: Checked inductivity of 18306 backedges. 519 proven. 1598 refuted. 0 times theorem prover too weak. 16189 trivial. 0 not checked. [2020-07-20 11:04:38,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048117951] [2020-07-20 11:04:38,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:04:38,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:04:38,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471779685] [2020-07-20 11:04:38,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:04:38,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:04:38,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:04:38,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:04:38,187 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-20 11:04:38,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:38,728 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-20 11:04:38,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:04:38,729 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 790 [2020-07-20 11:04:38,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:38,740 INFO L225 Difference]: With dead ends: 348 [2020-07-20 11:04:38,741 INFO L226 Difference]: Without dead ends: 334 [2020-07-20 11:04:38,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1586 GetRequests, 1547 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:04:38,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-20 11:04:38,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-20 11:04:38,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 11:04:38,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 11:04:38,798 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 790 [2020-07-20 11:04:38,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:38,799 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 11:04:38,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:04:38,799 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 11:04:38,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1143 [2020-07-20 11:04:38,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:38,816 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 67, 66, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 22, 21, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:39,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:39,032 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:39,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:39,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1774737146, now seen corresponding path program 12 times [2020-07-20 11:04:39,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:39,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981670479] [2020-07-20 11:04:39,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:40,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:40,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 2537 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:04:40,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:04:41,229 INFO L134 CoverageAnalysis]: Checked inductivity of 38740 backedges. 773 proven. 2758 refuted. 0 times theorem prover too weak. 35209 trivial. 0 not checked. [2020-07-20 11:04:41,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:04:50,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:50,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:55,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:55,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:57,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:57,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:57,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:57,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:04:58,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:00,287 INFO L134 CoverageAnalysis]: Checked inductivity of 38740 backedges. 775 proven. 2789 refuted. 0 times theorem prover too weak. 35176 trivial. 0 not checked. [2020-07-20 11:05:00,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981670479] [2020-07-20 11:05:00,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:00,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:05:00,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952899138] [2020-07-20 11:05:00,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:05:00,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:00,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:05:00,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:05:00,291 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 21 states. [2020-07-20 11:05:01,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:01,334 INFO L93 Difference]: Finished difference Result 276 states and 988 transitions. [2020-07-20 11:05:01,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:05:01,338 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1142 [2020-07-20 11:05:01,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:01,345 INFO L225 Difference]: With dead ends: 276 [2020-07-20 11:05:01,345 INFO L226 Difference]: Without dead ends: 259 [2020-07-20 11:05:01,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2291 GetRequests, 2247 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:05:01,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-07-20 11:05:01,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 195. [2020-07-20 11:05:01,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2020-07-20 11:05:01,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 582 transitions. [2020-07-20 11:05:01,393 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 582 transitions. Word has length 1142 [2020-07-20 11:05:01,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:01,394 INFO L479 AbstractCegarLoop]: Abstraction has 195 states and 582 transitions. [2020-07-20 11:05:01,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:05:01,394 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 582 transitions. [2020-07-20 11:05:01,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1258 [2020-07-20 11:05:01,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:01,420 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 91, 91, 66, 62, 48, 48, 48, 48, 48, 48, 48, 45, 45, 45, 45, 45, 45, 45, 34, 25, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:01,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:01,635 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:01,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:01,635 INFO L82 PathProgramCache]: Analyzing trace with hash -854686202, now seen corresponding path program 13 times [2020-07-20 11:05:01,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:01,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118476708] [2020-07-20 11:05:01,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:02,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:02,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 2797 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:05:02,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:03,627 INFO L134 CoverageAnalysis]: Checked inductivity of 47128 backedges. 718 proven. 3114 refuted. 0 times theorem prover too weak. 43296 trivial. 0 not checked. [2020-07-20 11:05:03,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:16,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:20,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:20,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:22,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:23,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:23,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:24,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:25,893 INFO L134 CoverageAnalysis]: Checked inductivity of 47128 backedges. 720 proven. 3142 refuted. 0 times theorem prover too weak. 43266 trivial. 0 not checked. [2020-07-20 11:05:25,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118476708] [2020-07-20 11:05:25,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:05:25,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:05:25,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042045243] [2020-07-20 11:05:25,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:05:25,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:05:25,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:05:25,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:05:25,896 INFO L87 Difference]: Start difference. First operand 195 states and 582 transitions. Second operand 21 states. [2020-07-20 11:05:26,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:05:26,792 INFO L93 Difference]: Finished difference Result 297 states and 1087 transitions. [2020-07-20 11:05:26,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:05:26,796 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1257 [2020-07-20 11:05:26,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:05:26,802 INFO L225 Difference]: With dead ends: 297 [2020-07-20 11:05:26,802 INFO L226 Difference]: Without dead ends: 283 [2020-07-20 11:05:26,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2521 GetRequests, 2477 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:05:26,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-20 11:05:26,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 196. [2020-07-20 11:05:26,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-20 11:05:26,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 582 transitions. [2020-07-20 11:05:26,843 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 582 transitions. Word has length 1257 [2020-07-20 11:05:26,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:05:26,844 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 582 transitions. [2020-07-20 11:05:26,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:05:26,844 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 582 transitions. [2020-07-20 11:05:26,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1487 [2020-07-20 11:05:26,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:05:26,868 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 104, 104, 86, 79, 57, 57, 57, 57, 57, 57, 57, 52, 52, 52, 52, 52, 52, 52, 36, 29, 27, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:05:27,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:27,082 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:05:27,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:05:27,083 INFO L82 PathProgramCache]: Analyzing trace with hash 1330845248, now seen corresponding path program 14 times [2020-07-20 11:05:27,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:05:27,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792667367] [2020-07-20 11:05:27,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:05:28,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:05:28,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 3303 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:05:28,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:05:29,289 INFO L134 CoverageAnalysis]: Checked inductivity of 66068 backedges. 988 proven. 4248 refuted. 0 times theorem prover too weak. 60832 trivial. 0 not checked. [2020-07-20 11:05:29,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:05:37,453 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:05:41,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:41,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:49,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:53,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:53,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:56,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:57,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:57,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:57,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:57,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:05:58,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:00,053 INFO L134 CoverageAnalysis]: Checked inductivity of 66068 backedges. 996 proven. 4280 refuted. 0 times theorem prover too weak. 60792 trivial. 0 not checked. [2020-07-20 11:06:00,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792667367] [2020-07-20 11:06:00,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:00,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:06:00,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233323323] [2020-07-20 11:06:00,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:06:00,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:00,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:06:00,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:06:00,056 INFO L87 Difference]: Start difference. First operand 196 states and 582 transitions. Second operand 23 states. [2020-07-20 11:06:01,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:01,741 INFO L93 Difference]: Finished difference Result 331 states and 1270 transitions. [2020-07-20 11:06:01,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:06:01,746 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1486 [2020-07-20 11:06:01,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:01,752 INFO L225 Difference]: With dead ends: 331 [2020-07-20 11:06:01,752 INFO L226 Difference]: Without dead ends: 262 [2020-07-20 11:06:01,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2980 GetRequests, 2931 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:06:01,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-20 11:06:01,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 216. [2020-07-20 11:06:01,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 11:06:01,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 668 transitions. [2020-07-20 11:06:01,794 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 668 transitions. Word has length 1486 [2020-07-20 11:06:01,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:01,794 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 668 transitions. [2020-07-20 11:06:01,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:06:01,795 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 668 transitions. [2020-07-20 11:06:01,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-20 11:06:01,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:01,807 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 72, 72, 57, 53, 37, 37, 37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 36, 36, 22, 20, 17, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:02,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:02,023 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:02,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:02,025 INFO L82 PathProgramCache]: Analyzing trace with hash -358228258, now seen corresponding path program 15 times [2020-07-20 11:06:02,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:02,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044120658] [2020-07-20 11:06:02,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:03,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:03,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 2221 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:06:03,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 29482 backedges. 797 proven. 2585 refuted. 0 times theorem prover too weak. 26100 trivial. 0 not checked. [2020-07-20 11:06:03,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:06,714 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:06:07,719 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:06:07,833 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:06:07,948 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:06:08,061 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:06:16,612 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:06:16,719 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:06:17,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:21,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:25,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:26,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:27,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:27,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:27,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:28,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:28,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:28,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:28,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:29,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 29482 backedges. 801 proven. 2621 refuted. 0 times theorem prover too weak. 26060 trivial. 0 not checked. [2020-07-20 11:06:30,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044120658] [2020-07-20 11:06:30,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:06:30,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:06:30,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577057196] [2020-07-20 11:06:30,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:06:30,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:06:30,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:06:30,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:06:30,928 INFO L87 Difference]: Start difference. First operand 216 states and 668 transitions. Second operand 23 states. [2020-07-20 11:06:32,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:06:32,539 INFO L93 Difference]: Finished difference Result 293 states and 1058 transitions. [2020-07-20 11:06:32,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:06:32,545 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 999 [2020-07-20 11:06:32,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:06:32,551 INFO L225 Difference]: With dead ends: 293 [2020-07-20 11:06:32,552 INFO L226 Difference]: Without dead ends: 276 [2020-07-20 11:06:32,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2006 GetRequests, 1957 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:06:32,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2020-07-20 11:06:32,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 209. [2020-07-20 11:06:32,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 11:06:32,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 628 transitions. [2020-07-20 11:06:32,597 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 628 transitions. Word has length 999 [2020-07-20 11:06:32,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:06:32,598 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 628 transitions. [2020-07-20 11:06:32,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:06:32,598 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 628 transitions. [2020-07-20 11:06:32,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1154 [2020-07-20 11:06:32,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:06:32,618 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 81, 81, 68, 64, 44, 44, 44, 44, 44, 44, 44, 40, 40, 40, 40, 40, 40, 40, 28, 20, 20, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:06:32,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:32,832 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:06:32,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:06:32,833 INFO L82 PathProgramCache]: Analyzing trace with hash -739530113, now seen corresponding path program 16 times [2020-07-20 11:06:32,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:06:32,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352272468] [2020-07-20 11:06:32,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:06:33,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:06:34,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 2562 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:06:34,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:06:34,807 INFO L134 CoverageAnalysis]: Checked inductivity of 39470 backedges. 836 proven. 2666 refuted. 0 times theorem prover too weak. 35968 trivial. 0 not checked. [2020-07-20 11:06:34,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:06:38,007 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:06:39,236 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:06:39,345 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:06:39,463 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:06:39,579 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:06:39,794 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:06:39,903 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:06:50,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:54,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:54,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:58,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:58,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:58,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:59,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:06:59,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:00,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:00,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:00,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:02,548 INFO L134 CoverageAnalysis]: Checked inductivity of 39470 backedges. 838 proven. 2694 refuted. 0 times theorem prover too weak. 35938 trivial. 0 not checked. [2020-07-20 11:07:02,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352272468] [2020-07-20 11:07:02,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:02,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:07:02,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904836231] [2020-07-20 11:07:02,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:07:02,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:02,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:07:02,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:07:02,552 INFO L87 Difference]: Start difference. First operand 209 states and 628 transitions. Second operand 21 states. [2020-07-20 11:07:03,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:03,775 INFO L93 Difference]: Finished difference Result 331 states and 1344 transitions. [2020-07-20 11:07:03,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:07:03,779 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1153 [2020-07-20 11:07:03,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:03,788 INFO L225 Difference]: With dead ends: 331 [2020-07-20 11:07:03,789 INFO L226 Difference]: Without dead ends: 314 [2020-07-20 11:07:03,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2313 GetRequests, 2269 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:07:03,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-20 11:07:03,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 199. [2020-07-20 11:07:03,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-07-20 11:07:03,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 557 transitions. [2020-07-20 11:07:03,828 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 557 transitions. Word has length 1153 [2020-07-20 11:07:03,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:03,829 INFO L479 AbstractCegarLoop]: Abstraction has 199 states and 557 transitions. [2020-07-20 11:07:03,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:07:03,829 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 557 transitions. [2020-07-20 11:07:03,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1058 [2020-07-20 11:07:03,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:03,839 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 75, 75, 62, 58, 40, 40, 40, 40, 40, 40, 40, 37, 37, 37, 37, 37, 37, 37, 25, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:04,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:04,044 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:04,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:04,045 INFO L82 PathProgramCache]: Analyzing trace with hash -888336944, now seen corresponding path program 17 times [2020-07-20 11:07:04,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:04,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768000885] [2020-07-20 11:07:04,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:05,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:05,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 2349 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:07:05,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:05,821 INFO L134 CoverageAnalysis]: Checked inductivity of 33068 backedges. 723 proven. 2101 refuted. 0 times theorem prover too weak. 30244 trivial. 0 not checked. [2020-07-20 11:07:05,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:13,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:13,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:15,935 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 11:07:16,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:16,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:17,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:17,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:17,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:17,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:18,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:20,075 INFO L134 CoverageAnalysis]: Checked inductivity of 33068 backedges. 723 proven. 2127 refuted. 0 times theorem prover too weak. 30218 trivial. 0 not checked. [2020-07-20 11:07:20,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768000885] [2020-07-20 11:07:20,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:20,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:07:20,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33684495] [2020-07-20 11:07:20,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:07:20,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:20,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:07:20,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:07:20,078 INFO L87 Difference]: Start difference. First operand 199 states and 557 transitions. Second operand 19 states. [2020-07-20 11:07:21,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:07:21,062 INFO L93 Difference]: Finished difference Result 403 states and 2000 transitions. [2020-07-20 11:07:21,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:07:21,068 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1057 [2020-07-20 11:07:21,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:07:21,080 INFO L225 Difference]: With dead ends: 403 [2020-07-20 11:07:21,080 INFO L226 Difference]: Without dead ends: 386 [2020-07-20 11:07:21,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2120 GetRequests, 2081 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:07:21,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2020-07-20 11:07:21,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 201. [2020-07-20 11:07:21,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-20 11:07:21,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 571 transitions. [2020-07-20 11:07:21,149 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 571 transitions. Word has length 1057 [2020-07-20 11:07:21,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:07:21,150 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 571 transitions. [2020-07-20 11:07:21,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:07:21,150 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 571 transitions. [2020-07-20 11:07:21,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1145 [2020-07-20 11:07:21,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:07:21,167 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 80, 80, 68, 67, 43, 43, 43, 43, 43, 43, 43, 40, 40, 40, 40, 40, 40, 40, 27, 25, 20, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:07:21,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:21,381 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:07:21,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:07:21,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1170655446, now seen corresponding path program 18 times [2020-07-20 11:07:21,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:07:21,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304502480] [2020-07-20 11:07:21,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:07:22,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:07:22,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 2541 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:07:22,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:07:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 38825 backedges. 1109 proven. 3287 refuted. 0 times theorem prover too weak. 34429 trivial. 0 not checked. [2020-07-20 11:07:23,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:07:26,268 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:26,373 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:26,500 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:26,609 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:27,141 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:07:27,248 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:07:27,357 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:07:27,468 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:07:28,192 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:07:28,303 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:07:28,423 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:07:28,543 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:07:28,654 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 11:07:28,951 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:07:36,850 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:36,958 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:37,068 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:37,178 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:37,740 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:07:37,857 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:07:37,984 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:07:38,099 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:07:38,222 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:07:38,338 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:07:38,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:43,584 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:43,686 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:07:43,794 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:43,899 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:07:44,008 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:07:44,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:44,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:50,170 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:07:50,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:50,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:52,771 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 11:07:53,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:53,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:54,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:55,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:56,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:07:58,085 INFO L134 CoverageAnalysis]: Checked inductivity of 38825 backedges. 1111 proven. 3337 refuted. 0 times theorem prover too weak. 34377 trivial. 0 not checked. [2020-07-20 11:07:58,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304502480] [2020-07-20 11:07:58,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:07:58,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:07:58,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231934217] [2020-07-20 11:07:58,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:07:58,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:07:58,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:07:58,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:07:58,089 INFO L87 Difference]: Start difference. First operand 201 states and 571 transitions. Second operand 25 states. [2020-07-20 11:08:00,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:00,405 INFO L93 Difference]: Finished difference Result 292 states and 938 transitions. [2020-07-20 11:08:00,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:08:00,411 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1144 [2020-07-20 11:08:00,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:00,416 INFO L225 Difference]: With dead ends: 292 [2020-07-20 11:08:00,417 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 11:08:00,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2297 GetRequests, 2243 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:08:00,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 11:08:00,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 240. [2020-07-20 11:08:00,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 11:08:00,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 11:08:00,456 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1144 [2020-07-20 11:08:00,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:00,457 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 11:08:00,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:08:00,457 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 11:08:00,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 925 [2020-07-20 11:08:00,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:00,473 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 54, 53, 34, 34, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 21, 19, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:00,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:00,683 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:00,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:00,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1162518926, now seen corresponding path program 19 times [2020-07-20 11:08:00,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:00,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142704953] [2020-07-20 11:08:00,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:01,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:01,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 2053 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:08:01,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:02,592 INFO L134 CoverageAnalysis]: Checked inductivity of 25121 backedges. 723 proven. 2039 refuted. 0 times theorem prover too weak. 22359 trivial. 0 not checked. [2020-07-20 11:08:02,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:05,298 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:08:05,408 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:08:06,562 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:08:06,675 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:08:06,782 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:08:15,386 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:08:15,495 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:08:15,602 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:15,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:20,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:23,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:23,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:23,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:24,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:25,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:25,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:25,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:25,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:25,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:27,667 INFO L134 CoverageAnalysis]: Checked inductivity of 25121 backedges. 723 proven. 2071 refuted. 0 times theorem prover too weak. 22327 trivial. 0 not checked. [2020-07-20 11:08:27,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142704953] [2020-07-20 11:08:27,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:27,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:08:27,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658548178] [2020-07-20 11:08:27,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:08:27,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:27,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:08:27,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:08:27,670 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-20 11:08:29,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:29,113 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-20 11:08:29,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:08:29,120 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 924 [2020-07-20 11:08:29,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:29,128 INFO L225 Difference]: With dead ends: 357 [2020-07-20 11:08:29,128 INFO L226 Difference]: Without dead ends: 340 [2020-07-20 11:08:29,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1855 GetRequests, 1811 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:08:29,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-20 11:08:29,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2020-07-20 11:08:29,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 11:08:29,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 608 transitions. [2020-07-20 11:08:29,171 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 608 transitions. Word has length 924 [2020-07-20 11:08:29,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:29,171 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 608 transitions. [2020-07-20 11:08:29,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:08:29,172 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 608 transitions. [2020-07-20 11:08:29,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 936 [2020-07-20 11:08:29,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:29,185 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 66, 66, 53, 53, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 20, 18, 18, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:08:29,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:29,386 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:08:29,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:08:29,388 INFO L82 PathProgramCache]: Analyzing trace with hash -788228727, now seen corresponding path program 20 times [2020-07-20 11:08:29,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:08:29,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404682548] [2020-07-20 11:08:29,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:08:30,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:08:30,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 2078 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:08:30,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:08:31,307 INFO L134 CoverageAnalysis]: Checked inductivity of 25768 backedges. 906 proven. 2294 refuted. 0 times theorem prover too weak. 22568 trivial. 0 not checked. [2020-07-20 11:08:31,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:08:33,771 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:33,881 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:34,459 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:08:34,573 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:08:34,691 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:08:34,811 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:08:35,912 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:08:36,047 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:08:36,188 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:08:36,323 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:08:36,477 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:08:36,600 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:08:36,714 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:08:36,823 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:08:36,926 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:08:44,270 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:44,373 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:45,021 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:08:45,134 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:08:45,248 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:08:45,357 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:08:45,587 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:08:46,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:50,397 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:50,506 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:08:50,612 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:08:50,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:50,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:53,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:53,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:54,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:54,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:54,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:54,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:55,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:55,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:55,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:56,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:56,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:56,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:08:58,490 INFO L134 CoverageAnalysis]: Checked inductivity of 25768 backedges. 910 proven. 2332 refuted. 0 times theorem prover too weak. 22526 trivial. 0 not checked. [2020-07-20 11:08:58,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404682548] [2020-07-20 11:08:58,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:08:58,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:08:58,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362544354] [2020-07-20 11:08:58,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:08:58,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:08:58,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:08:58,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:08:58,493 INFO L87 Difference]: Start difference. First operand 226 states and 608 transitions. Second operand 23 states. [2020-07-20 11:08:59,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:08:59,818 INFO L93 Difference]: Finished difference Result 366 states and 1284 transitions. [2020-07-20 11:08:59,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:08:59,821 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 935 [2020-07-20 11:08:59,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:08:59,828 INFO L225 Difference]: With dead ends: 366 [2020-07-20 11:08:59,828 INFO L226 Difference]: Without dead ends: 323 [2020-07-20 11:08:59,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1878 GetRequests, 1829 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:08:59,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-20 11:08:59,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 222. [2020-07-20 11:08:59,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 11:08:59,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 594 transitions. [2020-07-20 11:08:59,870 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 594 transitions. Word has length 935 [2020-07-20 11:08:59,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:08:59,870 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 594 transitions. [2020-07-20 11:08:59,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:08:59,871 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 594 transitions. [2020-07-20 11:08:59,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1186 [2020-07-20 11:08:59,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:08:59,889 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 85, 85, 71, 69, 44, 44, 44, 44, 44, 44, 44, 42, 42, 42, 42, 42, 42, 42, 29, 25, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:09:00,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:00,103 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:09:00,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:09:00,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1959562233, now seen corresponding path program 21 times [2020-07-20 11:09:00,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:09:00,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031951715] [2020-07-20 11:09:00,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:01,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:09:01,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 2632 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:09:01,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:09:02,514 INFO L134 CoverageAnalysis]: Checked inductivity of 41651 backedges. 831 proven. 2366 refuted. 0 times theorem prover too weak. 38454 trivial. 0 not checked. [2020-07-20 11:09:02,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:09:13,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:13,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:18,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:18,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:24,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:24,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:25,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:25,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:26,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:26,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:26,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:26,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:26,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:27,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:09:29,512 INFO L134 CoverageAnalysis]: Checked inductivity of 41651 backedges. 833 proven. 2388 refuted. 0 times theorem prover too weak. 38430 trivial. 0 not checked. [2020-07-20 11:09:29,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031951715] [2020-07-20 11:09:29,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:09:29,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:09:29,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306230554] [2020-07-20 11:09:29,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:09:29,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:09:29,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:09:29,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:09:29,515 INFO L87 Difference]: Start difference. First operand 222 states and 594 transitions. Second operand 19 states. [2020-07-20 11:09:31,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:09:31,064 INFO L93 Difference]: Finished difference Result 388 states and 1495 transitions. [2020-07-20 11:09:31,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:09:31,072 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1185 [2020-07-20 11:09:31,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:09:31,088 INFO L225 Difference]: With dead ends: 388 [2020-07-20 11:09:31,088 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 11:09:31,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2376 GetRequests, 2337 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:09:31,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 11:09:31,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 235. [2020-07-20 11:09:31,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 11:09:31,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 653 transitions. [2020-07-20 11:09:31,167 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 653 transitions. Word has length 1185 [2020-07-20 11:09:31,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:09:31,169 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 653 transitions. [2020-07-20 11:09:31,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:09:31,169 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 653 transitions. [2020-07-20 11:09:31,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1285 [2020-07-20 11:09:31,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:09:31,199 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 91, 91, 73, 70, 49, 49, 49, 49, 49, 49, 49, 45, 45, 45, 45, 45, 45, 45, 28, 25, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:09:31,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:31,414 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:09:31,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:09:31,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1194883359, now seen corresponding path program 22 times [2020-07-20 11:09:31,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:09:31,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562720161] [2020-07-20 11:09:31,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:09:32,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:09:32,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 2854 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:09:32,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:09:34,122 INFO L134 CoverageAnalysis]: Checked inductivity of 49099 backedges. 1073 proven. 3394 refuted. 0 times theorem prover too weak. 44632 trivial. 0 not checked. [2020-07-20 11:09:34,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:09:36,448 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 11:09:36,663 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:09:36,777 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:09:37,328 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:09:37,451 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:09:37,586 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:09:37,720 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:09:38,568 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:09:38,711 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:09:38,861 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:09:39,007 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:09:41,597 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:09:41,764 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:09:41,941 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:09:42,109 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:09:42,270 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:09:42,427 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 11:09:42,571 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 11:09:42,704 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:09:42,825 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:09:42,940 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:09:43,047 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:09:59,709 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:09:59,813 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:09:59,933 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:10:00,059 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:10:00,739 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:10:00,858 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:10:00,994 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:01,123 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:01,245 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:10:01,365 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:10:01,476 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:10:01,584 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:10:01,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:01,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:06,502 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 11:10:06,611 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 11:10:06,729 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:10:06,847 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:10:07,318 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:10:07,425 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 11:10:07,551 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:10:07,679 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:10:07,800 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:07,911 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:10:08,014 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:10:08,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:12,014 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:10:12,123 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 11:10:12,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:14,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:15,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:15,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:16,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:16,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:16,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:16,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:17,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:20,281 INFO L134 CoverageAnalysis]: Checked inductivity of 49099 backedges. 1079 proven. 3428 refuted. 0 times theorem prover too weak. 44592 trivial. 0 not checked. [2020-07-20 11:10:20,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562720161] [2020-07-20 11:10:20,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:10:20,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 11:10:20,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64773251] [2020-07-20 11:10:20,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:10:20,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:10:20,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:10:20,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:10:20,286 INFO L87 Difference]: Start difference. First operand 235 states and 653 transitions. Second operand 23 states. [2020-07-20 11:10:22,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:10:22,564 INFO L93 Difference]: Finished difference Result 324 states and 1001 transitions. [2020-07-20 11:10:22,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:10:22,571 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1284 [2020-07-20 11:10:22,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:10:22,579 INFO L225 Difference]: With dead ends: 324 [2020-07-20 11:10:22,579 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 11:10:22,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2576 GetRequests, 2527 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:10:22,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 11:10:22,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 245. [2020-07-20 11:10:22,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2020-07-20 11:10:22,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 729 transitions. [2020-07-20 11:10:22,615 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 729 transitions. Word has length 1284 [2020-07-20 11:10:22,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:10:22,616 INFO L479 AbstractCegarLoop]: Abstraction has 245 states and 729 transitions. [2020-07-20 11:10:22,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:10:22,616 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 729 transitions. [2020-07-20 11:10:22,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1299 [2020-07-20 11:10:22,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:10:22,644 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 94, 94, 73, 72, 48, 48, 48, 48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 47, 26, 24, 24, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:10:22,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:22,859 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:10:22,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:10:22,860 INFO L82 PathProgramCache]: Analyzing trace with hash -189897110, now seen corresponding path program 23 times [2020-07-20 11:10:22,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:10:22,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534027256] [2020-07-20 11:10:22,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:10:24,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:10:24,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 2885 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:10:24,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:10:25,403 INFO L134 CoverageAnalysis]: Checked inductivity of 50128 backedges. 885 proven. 3073 refuted. 0 times theorem prover too weak. 46170 trivial. 0 not checked. [2020-07-20 11:10:25,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:10:28,160 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:10:28,982 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:10:29,092 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:10:29,211 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:10:29,329 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:10:31,498 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:10:31,612 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:10:31,746 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:10:31,872 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:10:31,991 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:10:32,103 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:10:32,211 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:10:47,457 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:10:47,565 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:10:47,682 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:10:47,800 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:10:48,571 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:10:48,697 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:10:48,827 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:10:48,960 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:10:49,081 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:10:49,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:10:55,079 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:10:55,183 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:10:55,296 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:10:55,407 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:10:55,513 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:10:55,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:00,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:00,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:01,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:02,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:02,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:02,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:03,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:03,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:03,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:04,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:07,213 INFO L134 CoverageAnalysis]: Checked inductivity of 50128 backedges. 889 proven. 3099 refuted. 0 times theorem prover too weak. 46140 trivial. 0 not checked. [2020-07-20 11:11:07,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534027256] [2020-07-20 11:11:07,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:07,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:11:07,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747568233] [2020-07-20 11:11:07,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:11:07,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:07,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:11:07,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:11:07,218 INFO L87 Difference]: Start difference. First operand 245 states and 729 transitions. Second operand 21 states. [2020-07-20 11:11:09,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:09,058 INFO L93 Difference]: Finished difference Result 337 states and 1123 transitions. [2020-07-20 11:11:09,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:11:09,067 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1298 [2020-07-20 11:11:09,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:09,074 INFO L225 Difference]: With dead ends: 337 [2020-07-20 11:11:09,075 INFO L226 Difference]: Without dead ends: 314 [2020-07-20 11:11:09,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2603 GetRequests, 2559 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:11:09,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-20 11:11:09,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 235. [2020-07-20 11:11:09,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 11:11:09,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 647 transitions. [2020-07-20 11:11:09,126 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 647 transitions. Word has length 1298 [2020-07-20 11:11:09,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:09,127 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 647 transitions. [2020-07-20 11:11:09,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:11:09,128 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 647 transitions. [2020-07-20 11:11:09,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 11:11:09,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:09,155 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 89, 89, 75, 68, 47, 47, 47, 47, 47, 47, 47, 44, 44, 44, 44, 44, 44, 44, 31, 21, 21, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:09,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:09,369 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:09,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:09,370 INFO L82 PathProgramCache]: Analyzing trace with hash -994099852, now seen corresponding path program 24 times [2020-07-20 11:11:09,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:09,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280449480] [2020-07-20 11:11:09,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:10,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:10,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 2773 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:11:10,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:11:11,849 INFO L134 CoverageAnalysis]: Checked inductivity of 46309 backedges. 898 proven. 2406 refuted. 0 times theorem prover too weak. 43005 trivial. 0 not checked. [2020-07-20 11:11:11,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:11:16,288 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:11:16,404 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:16,515 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:17,483 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:11:17,611 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:11:17,745 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 11:11:17,872 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 11:11:17,981 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:11:18,095 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:11:25,495 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 11:11:27,151 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:11:27,266 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:11:27,380 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:27,493 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:27,600 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:11:27,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:33,587 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:11:38,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:44,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:45,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:46,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:46,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:46,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:46,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:46,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:47,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:11:49,989 INFO L134 CoverageAnalysis]: Checked inductivity of 46309 backedges. 898 proven. 2429 refuted. 0 times theorem prover too weak. 42982 trivial. 0 not checked. [2020-07-20 11:11:49,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280449480] [2020-07-20 11:11:49,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:11:49,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 11:11:49,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64651431] [2020-07-20 11:11:49,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:11:49,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:11:49,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:11:49,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:11:49,993 INFO L87 Difference]: Start difference. First operand 235 states and 647 transitions. Second operand 19 states. [2020-07-20 11:11:51,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:11:51,346 INFO L93 Difference]: Finished difference Result 394 states and 1463 transitions. [2020-07-20 11:11:51,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:11:51,352 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1248 [2020-07-20 11:11:51,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:11:51,363 INFO L225 Difference]: With dead ends: 394 [2020-07-20 11:11:51,363 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 11:11:51,367 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2502 GetRequests, 2463 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:11:51,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 11:11:51,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 226. [2020-07-20 11:11:51,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 11:11:51,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 597 transitions. [2020-07-20 11:11:51,424 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 597 transitions. Word has length 1248 [2020-07-20 11:11:51,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:11:51,425 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 597 transitions. [2020-07-20 11:11:51,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:11:51,425 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 597 transitions. [2020-07-20 11:11:51,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1036 [2020-07-20 11:11:51,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:11:51,443 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 75, 75, 62, 60, 38, 38, 38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 37, 25, 22, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:11:51,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:51,652 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:11:51,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:11:51,653 INFO L82 PathProgramCache]: Analyzing trace with hash 283363076, now seen corresponding path program 25 times [2020-07-20 11:11:51,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:11:51,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108678928] [2020-07-20 11:11:51,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:11:53,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:11:53,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 2299 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:11:53,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:11:54,176 INFO L134 CoverageAnalysis]: Checked inductivity of 31637 backedges. 1449 proven. 2506 refuted. 0 times theorem prover too weak. 27682 trivial. 0 not checked. [2020-07-20 11:11:54,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:11:56,713 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:11:56,819 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:11:56,927 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:57,043 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:11:57,559 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:11:57,677 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:11:57,801 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:11:57,924 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:11:58,064 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:11:58,199 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:11:58,351 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:11:58,504 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:11:59,183 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:11:59,339 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:11:59,506 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:11:59,668 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:00,787 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:12:00,937 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:12:01,094 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:12:01,255 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:12:01,416 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 11:12:01,579 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 11:12:01,736 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 11:12:01,881 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 11:12:02,028 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 11:12:02,145 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 11:12:02,261 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:12:02,382 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:12:02,493 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:09,899 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:12:10,006 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:12:10,491 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:12:10,613 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:12:10,720 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:10,825 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:10,937 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:11,054 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:11,175 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:11,288 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:11,796 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:12:11,911 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 11:12:12,039 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:12,174 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:12:12,302 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:12:12,415 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:12:12,525 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:12:13,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:16,814 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:12:17,707 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:17,815 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 11:12:17,931 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:18,044 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:18,155 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:12:18,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:18,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:20,617 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:12:20,728 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:12:21,192 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:12:21,311 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:12:21,436 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:21,561 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:12:21,680 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 11:12:21,795 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 11:12:21,900 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:12:22,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:25,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:25,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:26,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:27,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:27,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:27,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:27,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:27,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:28,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:28,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:28,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:32,206 INFO L134 CoverageAnalysis]: Checked inductivity of 31637 backedges. 1451 proven. 2556 refuted. 0 times theorem prover too weak. 27630 trivial. 0 not checked. [2020-07-20 11:12:32,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108678928] [2020-07-20 11:12:32,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:12:32,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 11:12:32,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718331776] [2020-07-20 11:12:32,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:12:32,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:12:32,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:12:32,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:12:32,209 INFO L87 Difference]: Start difference. First operand 226 states and 597 transitions. Second operand 25 states. [2020-07-20 11:12:34,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:12:34,493 INFO L93 Difference]: Finished difference Result 321 states and 897 transitions. [2020-07-20 11:12:34,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:12:34,498 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1035 [2020-07-20 11:12:34,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:12:34,504 INFO L225 Difference]: With dead ends: 321 [2020-07-20 11:12:34,504 INFO L226 Difference]: Without dead ends: 290 [2020-07-20 11:12:34,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2079 GetRequests, 2025 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:12:34,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2020-07-20 11:12:34,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 284. [2020-07-20 11:12:34,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 11:12:34,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 753 transitions. [2020-07-20 11:12:34,549 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 753 transitions. Word has length 1035 [2020-07-20 11:12:34,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:12:34,550 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 753 transitions. [2020-07-20 11:12:34,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:12:34,550 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 753 transitions. [2020-07-20 11:12:34,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1159 [2020-07-20 11:12:34,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:12:34,571 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 83, 83, 69, 68, 43, 43, 43, 43, 43, 43, 43, 41, 41, 41, 41, 41, 41, 41, 27, 26, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:12:34,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:12:34,786 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:12:34,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:12:34,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1002709771, now seen corresponding path program 26 times [2020-07-20 11:12:34,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:12:34,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931464269] [2020-07-20 11:12:34,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:12:36,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:12:36,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 2572 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:12:36,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:12:37,477 INFO L134 CoverageAnalysis]: Checked inductivity of 39748 backedges. 1102 proven. 2477 refuted. 0 times theorem prover too weak. 36169 trivial. 0 not checked. [2020-07-20 11:12:37,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:12:41,132 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:12:41,235 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:12:42,045 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:12:42,155 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:12:42,275 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:42,391 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:12:42,505 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 11:12:42,610 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 11:12:50,195 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:12:50,306 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:12:50,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:50,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:59,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:59,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:12:59,587 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2020-07-20 11:13:00,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:00,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:02,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:03,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:03,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:03,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:03,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:04,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:13:09,080 INFO L134 CoverageAnalysis]: Checked inductivity of 39748 backedges. 1106 proven. 2506 refuted. 0 times theorem prover too weak. 36136 trivial. 0 not checked. [2020-07-20 11:13:09,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931464269] [2020-07-20 11:13:09,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:13:09,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 11:13:09,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706098320] [2020-07-20 11:13:09,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:13:09,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:13:09,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:13:09,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:13:09,083 INFO L87 Difference]: Start difference. First operand 284 states and 753 transitions. Second operand 21 states. [2020-07-20 11:13:11,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:13:11,070 INFO L93 Difference]: Finished difference Result 421 states and 1484 transitions. [2020-07-20 11:13:11,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:13:11,079 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1158 [2020-07-20 11:13:11,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:13:11,090 INFO L225 Difference]: With dead ends: 421 [2020-07-20 11:13:11,091 INFO L226 Difference]: Without dead ends: 412 [2020-07-20 11:13:11,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2323 GetRequests, 2279 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:13:11,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2020-07-20 11:13:11,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 333. [2020-07-20 11:13:11,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2020-07-20 11:13:11,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 1056 transitions. [2020-07-20 11:13:11,175 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 1056 transitions. Word has length 1158 [2020-07-20 11:13:11,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:13:11,175 INFO L479 AbstractCegarLoop]: Abstraction has 333 states and 1056 transitions. [2020-07-20 11:13:11,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:13:11,175 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 1056 transitions. [2020-07-20 11:13:11,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1981 [2020-07-20 11:13:11,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:13:11,213 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 130, 130, 102, 101, 82, 82, 82, 82, 82, 82, 82, 65, 65, 65, 65, 65, 65, 65, 64, 36, 28, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:13:11,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:11,414 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:13:11,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:13:11,415 INFO L82 PathProgramCache]: Analyzing trace with hash 34463102, now seen corresponding path program 27 times [2020-07-20 11:13:11,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:13:11,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415070720] [2020-07-20 11:13:11,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:13:13,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:13:13,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 4405 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:13:13,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:13:15,459 INFO L134 CoverageAnalysis]: Checked inductivity of 119465 backedges. 1515 proven. 5469 refuted. 0 times theorem prover too weak. 112481 trivial. 0 not checked. [2020-07-20 11:13:15,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:13:17,985 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 11:13:18,089 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 11:13:18,202 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 11:13:18,315 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 11:13:18,826 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 11:13:18,950 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 11:13:19,082 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:13:19,214 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:13:19,347 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:13:19,491 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 11:13:19,643 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:13:19,801 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 11:13:22,125 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:13:22,300 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 11:13:22,471 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:13:22,644 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 11:13:25,886 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 11:13:27,073 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:13:27,224 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:13:27,390 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:13:27,558 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 11:13:27,730 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 11:13:27,910 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 11:13:28,069 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 11:13:28,220 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 11:13:28,369 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 11:13:28,510 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 11:13:28,640 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 11:13:28,755 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 11:13:28,860 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37