/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 15:12:00,011 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 15:12:00,013 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 15:12:00,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 15:12:00,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 15:12:00,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 15:12:00,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 15:12:00,030 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 15:12:00,032 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 15:12:00,033 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 15:12:00,034 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 15:12:00,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 15:12:00,035 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 15:12:00,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 15:12:00,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 15:12:00,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 15:12:00,039 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 15:12:00,040 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 15:12:00,041 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 15:12:00,043 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 15:12:00,045 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 15:12:00,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 15:12:00,047 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 15:12:00,048 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 15:12:00,050 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 15:12:00,050 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 15:12:00,050 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 15:12:00,051 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 15:12:00,051 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 15:12:00,052 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 15:12:00,053 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 15:12:00,053 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 15:12:00,054 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 15:12:00,055 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 15:12:00,056 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 15:12:00,056 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 15:12:00,056 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 15:12:00,057 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 15:12:00,057 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 15:12:00,058 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 15:12:00,058 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 15:12:00,059 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 15:12:00,073 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 15:12:00,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 15:12:00,075 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 15:12:00,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 15:12:00,075 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 15:12:00,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 15:12:00,075 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 15:12:00,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 15:12:00,076 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 15:12:00,076 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 15:12:00,076 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 15:12:00,076 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 15:12:00,077 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 15:12:00,077 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 15:12:00,077 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 15:12:00,077 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 15:12:00,077 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 15:12:00,077 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 15:12:00,078 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 15:12:00,078 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 15:12:00,078 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 15:12:00,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:12:00,079 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 15:12:00,079 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 15:12:00,079 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 15:12:00,079 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 15:12:00,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:00,079 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 15:12:00,080 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 15:12:00,080 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 15:12:00,370 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 15:12:00,383 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 15:12:00,386 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 15:12:00,388 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 15:12:00,388 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 15:12:00,389 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:12:00,449 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee33d5745/6e0140fc1daf4641811706afb74b7569/FLAGe2d9434b2 [2020-07-20 15:12:01,188 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 15:12:01,189 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:12:01,216 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee33d5745/6e0140fc1daf4641811706afb74b7569/FLAGe2d9434b2 [2020-07-20 15:12:01,308 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee33d5745/6e0140fc1daf4641811706afb74b7569 [2020-07-20 15:12:01,318 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 15:12:01,320 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 15:12:01,321 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 15:12:01,321 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 15:12:01,325 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 15:12:01,326 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:12:01" (1/1) ... [2020-07-20 15:12:01,329 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ff9fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:01, skipping insertion in model container [2020-07-20 15:12:01,330 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:12:01" (1/1) ... [2020-07-20 15:12:01,338 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 15:12:01,546 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 15:12:03,280 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:12:03,295 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 15:12:04,324 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:12:04,364 INFO L208 MainTranslator]: Completed translation [2020-07-20 15:12:04,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04 WrapperNode [2020-07-20 15:12:04,365 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 15:12:04,366 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 15:12:04,366 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 15:12:04,366 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 15:12:04,380 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,435 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,436 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,551 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,565 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... [2020-07-20 15:12:04,583 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 15:12:04,584 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 15:12:04,584 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 15:12:04,584 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 15:12:04,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:12:04,662 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 15:12:04,662 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 15:12:04,662 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 15:12:04,662 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 15:12:04,663 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 15:12:04,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 15:12:04,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 15:12:04,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 15:12:04,664 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 15:12:04,665 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 15:12:04,666 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 15:12:04,666 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 15:12:04,666 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 15:12:04,666 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 15:12:04,667 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 15:12:04,668 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 15:12:04,668 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 15:12:04,668 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 15:12:04,668 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 15:12:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 15:12:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 15:12:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 15:12:04,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 15:12:08,853 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 15:12:08,854 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 15:12:08,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:12:08 BoogieIcfgContainer [2020-07-20 15:12:08,866 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 15:12:08,867 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 15:12:08,867 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 15:12:08,871 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 15:12:08,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:12:01" (1/3) ... [2020-07-20 15:12:08,872 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f410185 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:12:08, skipping insertion in model container [2020-07-20 15:12:08,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:12:04" (2/3) ... [2020-07-20 15:12:08,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f410185 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:12:08, skipping insertion in model container [2020-07-20 15:12:08,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:12:08" (3/3) ... [2020-07-20 15:12:08,875 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:12:08,885 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 15:12:08,895 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 15:12:08,907 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 15:12:08,937 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 15:12:08,937 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 15:12:08,937 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 15:12:08,938 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 15:12:08,938 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 15:12:08,938 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 15:12:08,938 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 15:12:08,938 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 15:12:08,978 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-07-20 15:12:09,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 15:12:09,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:09,073 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:12:09,074 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:09,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:09,081 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-07-20 15:12:09,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:09,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816234682] [2020-07-20 15:12:09,091 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:09,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:09,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:09,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 1886 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 15:12:09,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:10,089 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 15:12:10,090 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:10,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816234682] [2020-07-20 15:12:10,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:10,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:10,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267427325] [2020-07-20 15:12:10,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:10,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:10,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:10,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:10,116 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 3 states. [2020-07-20 15:12:10,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:10,525 INFO L93 Difference]: Finished difference Result 1974 states and 3501 transitions. [2020-07-20 15:12:10,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:10,528 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-20 15:12:10,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:10,556 INFO L225 Difference]: With dead ends: 1974 [2020-07-20 15:12:10,557 INFO L226 Difference]: Without dead ends: 1732 [2020-07-20 15:12:10,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:10,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1732 states. [2020-07-20 15:12:10,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1732 to 1730. [2020-07-20 15:12:10,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1730 states. [2020-07-20 15:12:10,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1730 states to 1730 states and 2860 transitions. [2020-07-20 15:12:10,744 INFO L78 Accepts]: Start accepts. Automaton has 1730 states and 2860 transitions. Word has length 496 [2020-07-20 15:12:10,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:10,746 INFO L479 AbstractCegarLoop]: Abstraction has 1730 states and 2860 transitions. [2020-07-20 15:12:10,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:10,746 INFO L276 IsEmpty]: Start isEmpty. Operand 1730 states and 2860 transitions. [2020-07-20 15:12:10,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 15:12:10,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:10,765 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:12:10,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:10,981 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:10,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:10,982 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-07-20 15:12:10,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:10,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485778268] [2020-07-20 15:12:10,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:11,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:11,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:11,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 1887 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:12:11,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:11,934 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 15:12:11,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:11,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485778268] [2020-07-20 15:12:11,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:11,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:12:11,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677248063] [2020-07-20 15:12:11,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:12:11,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:11,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:12:11,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:12:11,939 INFO L87 Difference]: Start difference. First operand 1730 states and 2860 transitions. Second operand 4 states. [2020-07-20 15:12:12,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:12,283 INFO L93 Difference]: Finished difference Result 5127 states and 8477 transitions. [2020-07-20 15:12:12,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:12:12,283 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-20 15:12:12,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:12,303 INFO L225 Difference]: With dead ends: 5127 [2020-07-20 15:12:12,303 INFO L226 Difference]: Without dead ends: 3412 [2020-07-20 15:12:12,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:12:12,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3412 states. [2020-07-20 15:12:12,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3412 to 3410. [2020-07-20 15:12:12,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3410 states. [2020-07-20 15:12:12,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 5616 transitions. [2020-07-20 15:12:12,493 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 5616 transitions. Word has length 496 [2020-07-20 15:12:12,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:12,498 INFO L479 AbstractCegarLoop]: Abstraction has 3410 states and 5616 transitions. [2020-07-20 15:12:12,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:12:12,498 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 5616 transitions. [2020-07-20 15:12:12,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 15:12:12,516 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:12,516 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:12,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:12,731 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:12,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:12,732 INFO L82 PathProgramCache]: Analyzing trace with hash 598630969, now seen corresponding path program 1 times [2020-07-20 15:12:12,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:12,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458231827] [2020-07-20 15:12:12,734 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:13,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:13,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:13,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 1892 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:13,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:13,561 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 15:12:13,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:13,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458231827] [2020-07-20 15:12:13,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:13,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:13,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132271294] [2020-07-20 15:12:13,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:13,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:13,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:13,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:13,565 INFO L87 Difference]: Start difference. First operand 3410 states and 5616 transitions. Second operand 3 states. [2020-07-20 15:12:13,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:13,953 INFO L93 Difference]: Finished difference Result 9907 states and 16272 transitions. [2020-07-20 15:12:13,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:13,954 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-20 15:12:13,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:13,995 INFO L225 Difference]: With dead ends: 9907 [2020-07-20 15:12:13,996 INFO L226 Difference]: Without dead ends: 6726 [2020-07-20 15:12:14,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:14,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6726 states. [2020-07-20 15:12:14,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6726 to 6724. [2020-07-20 15:12:14,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6724 states. [2020-07-20 15:12:14,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6724 states to 6724 states and 11036 transitions. [2020-07-20 15:12:14,291 INFO L78 Accepts]: Start accepts. Automaton has 6724 states and 11036 transitions. Word has length 498 [2020-07-20 15:12:14,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:14,292 INFO L479 AbstractCegarLoop]: Abstraction has 6724 states and 11036 transitions. [2020-07-20 15:12:14,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:14,292 INFO L276 IsEmpty]: Start isEmpty. Operand 6724 states and 11036 transitions. [2020-07-20 15:12:14,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 15:12:14,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:14,309 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:14,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:14,524 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:14,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:14,525 INFO L82 PathProgramCache]: Analyzing trace with hash 74932662, now seen corresponding path program 1 times [2020-07-20 15:12:14,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:14,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464670479] [2020-07-20 15:12:14,526 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:15,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:15,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:15,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 1673 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:15,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:15,294 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 15:12:15,295 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:15,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464670479] [2020-07-20 15:12:15,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:15,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:15,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695663773] [2020-07-20 15:12:15,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:15,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:15,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:15,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:15,298 INFO L87 Difference]: Start difference. First operand 6724 states and 11036 transitions. Second operand 3 states. [2020-07-20 15:12:15,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:15,690 INFO L93 Difference]: Finished difference Result 19916 states and 32645 transitions. [2020-07-20 15:12:15,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:15,691 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-20 15:12:15,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:15,778 INFO L225 Difference]: With dead ends: 19916 [2020-07-20 15:12:15,778 INFO L226 Difference]: Without dead ends: 13223 [2020-07-20 15:12:15,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:15,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13223 states. [2020-07-20 15:12:16,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13223 to 6750. [2020-07-20 15:12:16,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6750 states. [2020-07-20 15:12:16,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6750 states to 6750 states and 11074 transitions. [2020-07-20 15:12:16,223 INFO L78 Accepts]: Start accepts. Automaton has 6750 states and 11074 transitions. Word has length 499 [2020-07-20 15:12:16,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:16,223 INFO L479 AbstractCegarLoop]: Abstraction has 6750 states and 11074 transitions. [2020-07-20 15:12:16,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:16,224 INFO L276 IsEmpty]: Start isEmpty. Operand 6750 states and 11074 transitions. [2020-07-20 15:12:16,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 15:12:16,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:16,242 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:16,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:16,457 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:16,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:16,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1851088404, now seen corresponding path program 1 times [2020-07-20 15:12:16,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:16,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890327112] [2020-07-20 15:12:16,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:17,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:17,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:17,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1672 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:12:17,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:17,276 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 15:12:17,276 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:17,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890327112] [2020-07-20 15:12:17,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:17,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:12:17,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026581865] [2020-07-20 15:12:17,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:12:17,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:17,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:12:17,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:12:17,283 INFO L87 Difference]: Start difference. First operand 6750 states and 11074 transitions. Second operand 4 states. [2020-07-20 15:12:17,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:17,791 INFO L93 Difference]: Finished difference Result 15530 states and 25658 transitions. [2020-07-20 15:12:17,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:12:17,792 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 500 [2020-07-20 15:12:17,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:17,835 INFO L225 Difference]: With dead ends: 15530 [2020-07-20 15:12:17,836 INFO L226 Difference]: Without dead ends: 7841 [2020-07-20 15:12:17,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:12:17,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7841 states. [2020-07-20 15:12:19,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7841 to 7839. [2020-07-20 15:12:19,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7839 states. [2020-07-20 15:12:19,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7839 states to 7839 states and 12911 transitions. [2020-07-20 15:12:19,039 INFO L78 Accepts]: Start accepts. Automaton has 7839 states and 12911 transitions. Word has length 500 [2020-07-20 15:12:19,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:19,040 INFO L479 AbstractCegarLoop]: Abstraction has 7839 states and 12911 transitions. [2020-07-20 15:12:19,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:12:19,040 INFO L276 IsEmpty]: Start isEmpty. Operand 7839 states and 12911 transitions. [2020-07-20 15:12:19,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 15:12:19,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:19,063 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:19,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:19,277 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:19,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:19,278 INFO L82 PathProgramCache]: Analyzing trace with hash 815858906, now seen corresponding path program 1 times [2020-07-20 15:12:19,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:19,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992379962] [2020-07-20 15:12:19,278 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:19,609 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:12:19,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:19,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 1471 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:12:19,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:19,823 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 15:12:19,824 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:19,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992379962] [2020-07-20 15:12:19,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:19,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:12:19,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419166407] [2020-07-20 15:12:19,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:12:19,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:19,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:12:19,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:12:19,827 INFO L87 Difference]: Start difference. First operand 7839 states and 12911 transitions. Second operand 9 states. [2020-07-20 15:12:28,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:28,612 INFO L93 Difference]: Finished difference Result 45742 states and 74245 transitions. [2020-07-20 15:12:28,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 15:12:28,613 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 502 [2020-07-20 15:12:28,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:28,723 INFO L225 Difference]: With dead ends: 45742 [2020-07-20 15:12:28,723 INFO L226 Difference]: Without dead ends: 44202 [2020-07-20 15:12:28,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 15:12:28,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44202 states. [2020-07-20 15:12:29,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44202 to 17515. [2020-07-20 15:12:29,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17515 states. [2020-07-20 15:12:29,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17515 states to 17515 states and 28472 transitions. [2020-07-20 15:12:29,877 INFO L78 Accepts]: Start accepts. Automaton has 17515 states and 28472 transitions. Word has length 502 [2020-07-20 15:12:29,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:29,878 INFO L479 AbstractCegarLoop]: Abstraction has 17515 states and 28472 transitions. [2020-07-20 15:12:29,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 15:12:29,878 INFO L276 IsEmpty]: Start isEmpty. Operand 17515 states and 28472 transitions. [2020-07-20 15:12:29,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 15:12:29,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:29,913 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:30,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:30,128 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:30,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:30,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1949345144, now seen corresponding path program 1 times [2020-07-20 15:12:30,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:30,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132037023] [2020-07-20 15:12:30,131 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:30,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:30,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:30,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 1907 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:30,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:30,863 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 15:12:30,863 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:30,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132037023] [2020-07-20 15:12:30,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:30,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:30,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723965663] [2020-07-20 15:12:30,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:30,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:30,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:30,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:30,866 INFO L87 Difference]: Start difference. First operand 17515 states and 28472 transitions. Second operand 3 states. [2020-07-20 15:12:32,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:32,982 INFO L93 Difference]: Finished difference Result 39371 states and 63759 transitions. [2020-07-20 15:12:32,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:32,983 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 15:12:32,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:33,046 INFO L225 Difference]: With dead ends: 39371 [2020-07-20 15:12:33,046 INFO L226 Difference]: Without dead ends: 25094 [2020-07-20 15:12:33,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:33,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25094 states. [2020-07-20 15:12:34,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25094 to 22146. [2020-07-20 15:12:34,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22146 states. [2020-07-20 15:12:34,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22146 states to 22146 states and 36124 transitions. [2020-07-20 15:12:34,078 INFO L78 Accepts]: Start accepts. Automaton has 22146 states and 36124 transitions. Word has length 502 [2020-07-20 15:12:34,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:34,079 INFO L479 AbstractCegarLoop]: Abstraction has 22146 states and 36124 transitions. [2020-07-20 15:12:34,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:34,079 INFO L276 IsEmpty]: Start isEmpty. Operand 22146 states and 36124 transitions. [2020-07-20 15:12:34,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 15:12:34,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:34,100 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:34,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:34,301 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:34,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:34,303 INFO L82 PathProgramCache]: Analyzing trace with hash 277201045, now seen corresponding path program 1 times [2020-07-20 15:12:34,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:34,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792742899] [2020-07-20 15:12:34,305 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:34,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:34,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:34,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 1897 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:34,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:35,063 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 15:12:35,063 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:35,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792742899] [2020-07-20 15:12:35,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:35,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:35,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212560659] [2020-07-20 15:12:35,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:35,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:35,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:35,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:35,065 INFO L87 Difference]: Start difference. First operand 22146 states and 36124 transitions. Second operand 3 states. [2020-07-20 15:12:36,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:36,521 INFO L93 Difference]: Finished difference Result 65489 states and 106747 transitions. [2020-07-20 15:12:36,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:36,521 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 15:12:36,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:36,619 INFO L225 Difference]: With dead ends: 65489 [2020-07-20 15:12:36,620 INFO L226 Difference]: Without dead ends: 43719 [2020-07-20 15:12:36,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:36,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43719 states. [2020-07-20 15:12:39,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43719 to 43717. [2020-07-20 15:12:39,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43717 states. [2020-07-20 15:12:39,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43717 states to 43717 states and 71029 transitions. [2020-07-20 15:12:39,425 INFO L78 Accepts]: Start accepts. Automaton has 43717 states and 71029 transitions. Word has length 502 [2020-07-20 15:12:39,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:39,426 INFO L479 AbstractCegarLoop]: Abstraction has 43717 states and 71029 transitions. [2020-07-20 15:12:39,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:39,426 INFO L276 IsEmpty]: Start isEmpty. Operand 43717 states and 71029 transitions. [2020-07-20 15:12:39,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 15:12:39,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:39,454 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:39,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:39,661 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:39,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:39,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1729528208, now seen corresponding path program 1 times [2020-07-20 15:12:39,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:39,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009626875] [2020-07-20 15:12:39,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:40,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:12:40,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:40,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 1456 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:40,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:40,118 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 15:12:40,119 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:40,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009626875] [2020-07-20 15:12:40,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:40,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:40,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442263658] [2020-07-20 15:12:40,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:40,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:40,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:40,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:40,122 INFO L87 Difference]: Start difference. First operand 43717 states and 71029 transitions. Second operand 3 states. [2020-07-20 15:12:42,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:42,998 INFO L93 Difference]: Finished difference Result 130898 states and 212651 transitions. [2020-07-20 15:12:42,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:42,999 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 15:12:42,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:43,134 INFO L225 Difference]: With dead ends: 130898 [2020-07-20 15:12:43,134 INFO L226 Difference]: Without dead ends: 87295 [2020-07-20 15:12:43,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:43,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87295 states. [2020-07-20 15:12:46,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87295 to 43815. [2020-07-20 15:12:46,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43815 states. [2020-07-20 15:12:46,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43815 states to 43815 states and 71163 transitions. [2020-07-20 15:12:46,762 INFO L78 Accepts]: Start accepts. Automaton has 43815 states and 71163 transitions. Word has length 502 [2020-07-20 15:12:46,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:46,762 INFO L479 AbstractCegarLoop]: Abstraction has 43815 states and 71163 transitions. [2020-07-20 15:12:46,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:46,762 INFO L276 IsEmpty]: Start isEmpty. Operand 43815 states and 71163 transitions. [2020-07-20 15:12:46,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 15:12:46,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:46,784 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:46,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:46,990 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:46,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:46,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1225472698, now seen corresponding path program 1 times [2020-07-20 15:12:46,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:46,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763015007] [2020-07-20 15:12:46,994 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:47,380 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:47,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:47,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:47,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:47,503 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 15:12:47,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:47,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763015007] [2020-07-20 15:12:47,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:47,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:47,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111401619] [2020-07-20 15:12:47,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:47,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:47,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:47,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:47,506 INFO L87 Difference]: Start difference. First operand 43815 states and 71163 transitions. Second operand 3 states. [2020-07-20 15:12:50,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:50,692 INFO L93 Difference]: Finished difference Result 130491 states and 211909 transitions. [2020-07-20 15:12:50,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:50,693 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-20 15:12:50,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:50,805 INFO L225 Difference]: With dead ends: 130491 [2020-07-20 15:12:50,806 INFO L226 Difference]: Without dead ends: 87167 [2020-07-20 15:12:50,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:50,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87167 states. [2020-07-20 15:12:53,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87167 to 43967. [2020-07-20 15:12:53,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43967 states. [2020-07-20 15:12:53,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43967 states to 43967 states and 71387 transitions. [2020-07-20 15:12:53,243 INFO L78 Accepts]: Start accepts. Automaton has 43967 states and 71387 transitions. Word has length 503 [2020-07-20 15:12:53,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:53,244 INFO L479 AbstractCegarLoop]: Abstraction has 43967 states and 71387 transitions. [2020-07-20 15:12:53,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:53,244 INFO L276 IsEmpty]: Start isEmpty. Operand 43967 states and 71387 transitions. [2020-07-20 15:12:53,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 15:12:53,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:53,267 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:12:53,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:53,482 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:53,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:53,483 INFO L82 PathProgramCache]: Analyzing trace with hash 297843511, now seen corresponding path program 1 times [2020-07-20 15:12:53,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:53,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311403267] [2020-07-20 15:12:53,484 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:12:53,871 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:53,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:53,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 1676 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:53,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:53,990 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 15:12:53,990 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:53,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311403267] [2020-07-20 15:12:53,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:53,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:53,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933522944] [2020-07-20 15:12:53,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:53,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:53,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:53,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:53,993 INFO L87 Difference]: Start difference. First operand 43967 states and 71387 transitions. Second operand 3 states. [2020-07-20 15:12:58,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:58,313 INFO L93 Difference]: Finished difference Result 131500 states and 213518 transitions. [2020-07-20 15:12:58,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:58,313 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-20 15:12:58,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:58,418 INFO L225 Difference]: With dead ends: 131500 [2020-07-20 15:12:58,419 INFO L226 Difference]: Without dead ends: 87726 [2020-07-20 15:12:58,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:58,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87726 states. [2020-07-20 15:13:00,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87726 to 44094. [2020-07-20 15:13:00,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44094 states. [2020-07-20 15:13:00,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44094 states to 44094 states and 71565 transitions. [2020-07-20 15:13:00,745 INFO L78 Accepts]: Start accepts. Automaton has 44094 states and 71565 transitions. Word has length 503 [2020-07-20 15:13:00,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:13:00,745 INFO L479 AbstractCegarLoop]: Abstraction has 44094 states and 71565 transitions. [2020-07-20 15:13:00,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:13:00,745 INFO L276 IsEmpty]: Start isEmpty. Operand 44094 states and 71565 transitions. [2020-07-20 15:13:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 15:13:00,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:13:00,772 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:13:00,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:13:00,986 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:13:00,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:13:00,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1956289972, now seen corresponding path program 1 times [2020-07-20 15:13:00,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:13:00,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547658422] [2020-07-20 15:13:00,988 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:13:01,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:13:01,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:13:01,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 1895 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:13:01,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:13:01,681 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 15:13:01,682 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:13:01,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547658422] [2020-07-20 15:13:01,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:13:01,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:13:01,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135662355] [2020-07-20 15:13:01,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:13:01,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:13:01,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:13:01,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:13:01,684 INFO L87 Difference]: Start difference. First operand 44094 states and 71565 transitions. Second operand 3 states. [2020-07-20 15:13:06,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:13:06,236 INFO L93 Difference]: Finished difference Result 129084 states and 209308 transitions. [2020-07-20 15:13:06,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:13:06,236 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-20 15:13:06,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:13:06,342 INFO L225 Difference]: With dead ends: 129084 [2020-07-20 15:13:06,342 INFO L226 Difference]: Without dead ends: 86534 [2020-07-20 15:13:06,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:13:06,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86534 states. [2020-07-20 15:13:12,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86534 to 86532. [2020-07-20 15:13:12,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86532 states. [2020-07-20 15:13:12,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86532 states to 86532 states and 139962 transitions. [2020-07-20 15:13:12,237 INFO L78 Accepts]: Start accepts. Automaton has 86532 states and 139962 transitions. Word has length 504 [2020-07-20 15:13:12,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:13:12,238 INFO L479 AbstractCegarLoop]: Abstraction has 86532 states and 139962 transitions. [2020-07-20 15:13:12,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:13:12,238 INFO L276 IsEmpty]: Start isEmpty. Operand 86532 states and 139962 transitions. [2020-07-20 15:13:12,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 15:13:12,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:13:12,275 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:13:12,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:13:12,476 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:13:12,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:13:12,477 INFO L82 PathProgramCache]: Analyzing trace with hash -980640222, now seen corresponding path program 1 times [2020-07-20 15:13:12,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:13:12,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244426630] [2020-07-20 15:13:12,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:13:12,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:13:12,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:13:12,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 1906 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:13:12,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:13:13,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:13:13,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:13:13,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244426630] [2020-07-20 15:13:13,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:13:13,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:13:13,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624915437] [2020-07-20 15:13:13,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:13:13,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:13:13,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:13:13,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:13:13,101 INFO L87 Difference]: Start difference. First operand 86532 states and 139962 transitions. Second operand 9 states. [2020-07-20 15:13:49,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:13:49,182 INFO L93 Difference]: Finished difference Result 516356 states and 838979 transitions. [2020-07-20 15:13:49,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 15:13:49,183 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 504 [2020-07-20 15:13:49,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:13:49,857 INFO L225 Difference]: With dead ends: 516356 [2020-07-20 15:13:49,857 INFO L226 Difference]: Without dead ends: 485858 [2020-07-20 15:13:49,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 15:13:50,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485858 states. [2020-07-20 15:14:02,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485858 to 173576. [2020-07-20 15:14:02,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173576 states. [2020-07-20 15:14:07,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173576 states to 173576 states and 280378 transitions. [2020-07-20 15:14:07,486 INFO L78 Accepts]: Start accepts. Automaton has 173576 states and 280378 transitions. Word has length 504 [2020-07-20 15:14:07,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:14:07,487 INFO L479 AbstractCegarLoop]: Abstraction has 173576 states and 280378 transitions. [2020-07-20 15:14:07,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 15:14:07,487 INFO L276 IsEmpty]: Start isEmpty. Operand 173576 states and 280378 transitions. [2020-07-20 15:14:07,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 15:14:07,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:14:07,542 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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 15:14:07,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:14:07,743 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:14:07,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:14:07,744 INFO L82 PathProgramCache]: Analyzing trace with hash -2126461271, now seen corresponding path program 1 times [2020-07-20 15:14:07,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:14:07,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593988225] [2020-07-20 15:14:07,745 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:14:08,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:14:08,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:14:08,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 1902 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:14:08,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:14:08,345 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 15:14:08,346 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:14:08,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593988225] [2020-07-20 15:14:08,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:14:08,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:14:08,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868482256] [2020-07-20 15:14:08,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:14:08,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:14:08,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:14:08,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:14:08,349 INFO L87 Difference]: Start difference. First operand 173576 states and 280378 transitions. Second operand 3 states. [2020-07-20 15:14:26,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:14:26,497 INFO L93 Difference]: Finished difference Result 418270 states and 677386 transitions. [2020-07-20 15:14:26,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:14:26,497 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-20 15:14:26,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:14:26,892 INFO L225 Difference]: With dead ends: 418270 [2020-07-20 15:14:26,892 INFO L226 Difference]: Without dead ends: 258308 [2020-07-20 15:14:27,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:14:27,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258308 states. [2020-07-20 15:14:47,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258308 to 235570. [2020-07-20 15:14:47,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235570 states. [2020-07-20 15:14:47,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235570 states to 235570 states and 380680 transitions. [2020-07-20 15:14:47,621 INFO L78 Accepts]: Start accepts. Automaton has 235570 states and 380680 transitions. Word has length 504 [2020-07-20 15:14:47,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:14:47,621 INFO L479 AbstractCegarLoop]: Abstraction has 235570 states and 380680 transitions. [2020-07-20 15:14:47,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:14:47,622 INFO L276 IsEmpty]: Start isEmpty. Operand 235570 states and 380680 transitions. [2020-07-20 15:14:47,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 15:14:47,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:14:47,706 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1] [2020-07-20 15:14:47,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:14:47,919 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:14:47,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:14:47,920 INFO L82 PathProgramCache]: Analyzing trace with hash 359846569, now seen corresponding path program 1 times [2020-07-20 15:14:47,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:14:47,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645722141] [2020-07-20 15:14:47,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:14:49,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:14:49,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:14:49,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 1912 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:14:49,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:14:49,394 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 15:14:49,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:14:49,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645722141] [2020-07-20 15:14:49,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:14:49,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:14:49,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248402653] [2020-07-20 15:14:49,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:14:49,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:14:49,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:14:49,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:14:49,399 INFO L87 Difference]: Start difference. First operand 235570 states and 380680 transitions. Second operand 4 states. [2020-07-20 15:15:23,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:15:23,819 INFO L93 Difference]: Finished difference Result 699624 states and 1130562 transitions. [2020-07-20 15:15:23,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:15:23,820 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-20 15:15:23,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:15:24,602 INFO L225 Difference]: With dead ends: 699624 [2020-07-20 15:15:24,602 INFO L226 Difference]: Without dead ends: 465760 [2020-07-20 15:15:24,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:15:25,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465760 states. [2020-07-20 15:16:04,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465760 to 465758. [2020-07-20 15:16:04,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 465758 states. [2020-07-20 15:16:05,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465758 states to 465758 states and 750550 transitions. [2020-07-20 15:16:05,686 INFO L78 Accepts]: Start accepts. Automaton has 465758 states and 750550 transitions. Word has length 505 [2020-07-20 15:16:05,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:16:05,686 INFO L479 AbstractCegarLoop]: Abstraction has 465758 states and 750550 transitions. [2020-07-20 15:16:05,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:16:05,686 INFO L276 IsEmpty]: Start isEmpty. Operand 465758 states and 750550 transitions. [2020-07-20 15:16:05,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-20 15:16:05,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:16:05,811 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1] [2020-07-20 15:16:06,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:16:06,012 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:16:06,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:16:06,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1172872875, now seen corresponding path program 1 times [2020-07-20 15:16:06,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:16:06,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924772625] [2020-07-20 15:16:06,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:16:06,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:16:06,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:16:06,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 1678 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:16:06,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:16:06,547 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 15:16:06,547 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:16:06,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924772625] [2020-07-20 15:16:06,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:16:06,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:16:06,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477322929] [2020-07-20 15:16:06,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:16:06,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:16:06,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:16:06,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:16:06,550 INFO L87 Difference]: Start difference. First operand 465758 states and 750550 transitions. Second operand 4 states. [2020-07-20 15:16:53,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:16:53,917 INFO L93 Difference]: Finished difference Result 954215 states and 1538694 transitions. [2020-07-20 15:16:53,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:16:53,918 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 506 [2020-07-20 15:16:53,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:16:54,780 INFO L225 Difference]: With dead ends: 954215 [2020-07-20 15:16:54,781 INFO L226 Difference]: Without dead ends: 478911 [2020-07-20 15:16:55,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:16:55,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478911 states. [2020-07-20 15:17:38,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478911 to 478909. [2020-07-20 15:17:38,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 478909 states. [2020-07-20 15:17:39,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478909 states to 478909 states and 770073 transitions. [2020-07-20 15:17:39,356 INFO L78 Accepts]: Start accepts. Automaton has 478909 states and 770073 transitions. Word has length 506 [2020-07-20 15:17:39,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:17:39,357 INFO L479 AbstractCegarLoop]: Abstraction has 478909 states and 770073 transitions. [2020-07-20 15:17:39,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:17:39,357 INFO L276 IsEmpty]: Start isEmpty. Operand 478909 states and 770073 transitions. [2020-07-20 15:17:40,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 15:17:40,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:17:40,541 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1] [2020-07-20 15:17:40,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:17:40,742 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:17:40,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:17:40,743 INFO L82 PathProgramCache]: Analyzing trace with hash 920041644, now seen corresponding path program 1 times [2020-07-20 15:17:40,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:17:40,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178957487] [2020-07-20 15:17:40,744 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:17:41,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:17:41,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:17:41,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:17:41,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:17:41,395 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 15:17:41,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:17:41,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178957487] [2020-07-20 15:17:41,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:17:41,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:17:41,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297797130] [2020-07-20 15:17:41,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:17:41,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:17:41,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:17:41,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:17:41,398 INFO L87 Difference]: Start difference. First operand 478909 states and 770073 transitions. Second operand 3 states. [2020-07-20 15:19:01,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:19:01,309 INFO L93 Difference]: Finished difference Result 1412611 states and 2269393 transitions. [2020-07-20 15:19:01,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:19:01,309 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-20 15:19:01,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:19:02,895 INFO L225 Difference]: With dead ends: 1412611 [2020-07-20 15:19:02,896 INFO L226 Difference]: Without dead ends: 940755 [2020-07-20 15:19:03,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:19:04,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 940755 states. [2020-07-20 15:20:39,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 940755 to 940753. [2020-07-20 15:20:39,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 940753 states. [2020-07-20 15:20:41,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 940753 states to 940753 states and 1506986 transitions. [2020-07-20 15:20:41,613 INFO L78 Accepts]: Start accepts. Automaton has 940753 states and 1506986 transitions. Word has length 507 [2020-07-20 15:20:41,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:20:41,614 INFO L479 AbstractCegarLoop]: Abstraction has 940753 states and 1506986 transitions. [2020-07-20 15:20:41,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:20:41,614 INFO L276 IsEmpty]: Start isEmpty. Operand 940753 states and 1506986 transitions. [2020-07-20 15:20:41,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-20 15:20:41,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:20:41,895 INFO L422 BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1] [2020-07-20 15:20:42,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:20:42,096 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:20:42,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:20:42,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1547199302, now seen corresponding path program 1 times [2020-07-20 15:20:42,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:20:42,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011023501] [2020-07-20 15:20:42,098 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 15:20:44,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:20:44,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:20:44,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 1456 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:20:44,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:20:44,220 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 15:20:44,221 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:20:44,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011023501] [2020-07-20 15:20:44,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:20:44,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:20:44,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796005979] [2020-07-20 15:20:44,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:20:44,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:20:44,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:20:44,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:20:44,231 INFO L87 Difference]: Start difference. First operand 940753 states and 1506986 transitions. Second operand 4 states.