/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:29:01,459 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:29:01,462 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:29:01,477 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:29:01,477 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:29:01,479 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:29:01,481 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:29:01,491 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:29:01,493 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:29:01,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:29:01,498 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:29:01,499 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:29:01,499 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:29:01,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:29:01,503 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:29:01,504 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:29:01,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:29:01,508 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:29:01,511 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:29:01,516 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:29:01,520 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:29:01,520 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:29:01,522 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:29:01,523 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:29:01,526 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 12:29:01,526 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 12:29:01,526 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 12:29:01,529 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 12:29:01,529 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 12:29:01,531 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 12:29:01,532 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 12:29:01,533 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 12:29:01,534 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 12:29:01,535 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 12:29:01,538 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 12:29:01,538 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 12:29:01,540 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 12:29:01,540 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 12:29:01,540 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:29:01,541 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:29:01,542 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:29:01,543 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 12:29:01,578 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:29:01,579 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:29:01,580 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:29:01,582 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:29:01,582 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:29:01,583 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:29:01,583 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:29:01,583 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:29:01,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:29:01,583 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:29:01,584 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:29:01,585 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:29:01,585 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:29:01,585 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:29:01,585 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:29:01,585 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:29:01,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:29:01,586 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:29:01,586 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:29:01,588 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:29:01,588 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:29:01,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:01,588 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:29:01,588 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:29:01,589 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 12:29:01,868 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:29:01,886 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:29:01,889 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:29:01,891 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:29:01,893 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:29:01,894 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-20 12:29:01,963 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b7a88e39/ad3a3c1ed75342c694b99410ea60e20f/FLAG01d5436e9 [2020-07-20 12:29:02,685 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:29:02,685 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-20 12:29:02,722 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b7a88e39/ad3a3c1ed75342c694b99410ea60e20f/FLAG01d5436e9 [2020-07-20 12:29:02,822 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b7a88e39/ad3a3c1ed75342c694b99410ea60e20f [2020-07-20 12:29:02,831 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:29:02,834 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:29:02,835 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:29:02,836 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:29:02,839 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:29:02,841 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:29:02" (1/1) ... [2020-07-20 12:29:02,844 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@522a051a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:02, skipping insertion in model container [2020-07-20 12:29:02,844 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:29:02" (1/1) ... [2020-07-20 12:29:02,852 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:29:03,052 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:29:04,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:29:04,542 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:29:05,629 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:29:05,667 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:29:05,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05 WrapperNode [2020-07-20 12:29:05,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:29:05,669 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:29:05,669 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:29:05,669 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:29:05,684 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,686 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,741 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,813 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,881 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (1/1) ... [2020-07-20 12:29:05,904 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:29:05,906 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:29:05,906 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:29:05,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:29:05,908 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (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 12:29:05,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:29:05,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:29:05,979 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:29:05,979 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:29:05,979 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:29:05,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 12:29:05,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 12:29:05,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 12:29:05,980 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 12:29:05,981 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:29:05,981 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:29:05,981 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 12:29:05,981 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 12:29:05,981 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 12:29:05,982 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 12:29:05,982 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 12:29:05,982 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 12:29:05,982 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 12:29:05,983 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 12:29:05,983 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 12:29:05,983 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:29:05,983 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:29:05,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:29:09,609 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:29:09,610 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 12:29:09,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:29:09 BoogieIcfgContainer [2020-07-20 12:29:09,627 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:29:09,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:29:09,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:29:09,634 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:29:09,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:29:02" (1/3) ... [2020-07-20 12:29:09,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38b14d64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:29:09, skipping insertion in model container [2020-07-20 12:29:09,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:29:05" (2/3) ... [2020-07-20 12:29:09,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38b14d64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:29:09, skipping insertion in model container [2020-07-20 12:29:09,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:29:09" (3/3) ... [2020-07-20 12:29:09,642 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-20 12:29:09,656 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:29:09,676 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 12:29:09,694 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 12:29:09,739 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:29:09,740 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:29:09,740 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:29:09,740 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:29:09,740 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:29:09,740 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:29:09,741 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:29:09,741 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:29:09,787 INFO L276 IsEmpty]: Start isEmpty. Operand 1393 states. [2020-07-20 12:29:09,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 12:29:09,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:09,839 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] [2020-07-20 12:29:09,840 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:09,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:09,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1447603851, now seen corresponding path program 1 times [2020-07-20 12:29:09,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:09,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964792975] [2020-07-20 12:29:09,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:10,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:10,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 2911 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:29:10,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:10,915 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 12:29:10,915 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:10,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964792975] [2020-07-20 12:29:10,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:10,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:29:10,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788031583] [2020-07-20 12:29:10,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:29:10,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:10,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:29:10,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:29:10,936 INFO L87 Difference]: Start difference. First operand 1393 states. Second operand 4 states. [2020-07-20 12:29:11,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:11,387 INFO L93 Difference]: Finished difference Result 4028 states and 7284 transitions. [2020-07-20 12:29:11,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 12:29:11,389 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 473 [2020-07-20 12:29:11,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:11,422 INFO L225 Difference]: With dead ends: 4028 [2020-07-20 12:29:11,422 INFO L226 Difference]: Without dead ends: 2704 [2020-07-20 12:29:11,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 470 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 12:29:11,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2704 states. [2020-07-20 12:29:11,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2704 to 2647. [2020-07-20 12:29:11,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-07-20 12:29:11,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4323 transitions. [2020-07-20 12:29:11,678 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4323 transitions. Word has length 473 [2020-07-20 12:29:11,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:11,682 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4323 transitions. [2020-07-20 12:29:11,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:29:11,682 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4323 transitions. [2020-07-20 12:29:11,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 12:29:11,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:11,699 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] [2020-07-20 12:29:11,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:11,915 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:11,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:11,916 INFO L82 PathProgramCache]: Analyzing trace with hash 339011516, now seen corresponding path program 1 times [2020-07-20 12:29:11,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:11,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192795068] [2020-07-20 12:29:11,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:12,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:12,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 2914 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:12,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:12,626 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 12:29:12,626 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:12,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192795068] [2020-07-20 12:29:12,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:12,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:12,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346464751] [2020-07-20 12:29:12,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:12,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:12,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:12,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:12,633 INFO L87 Difference]: Start difference. First operand 2647 states and 4323 transitions. Second operand 3 states. [2020-07-20 12:29:12,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:12,979 INFO L93 Difference]: Finished difference Result 7627 states and 12403 transitions. [2020-07-20 12:29:12,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:12,980 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 475 [2020-07-20 12:29:12,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:13,009 INFO L225 Difference]: With dead ends: 7627 [2020-07-20 12:29:13,009 INFO L226 Difference]: Without dead ends: 5145 [2020-07-20 12:29:13,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 473 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 12:29:13,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5145 states. [2020-07-20 12:29:13,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5145 to 5088. [2020-07-20 12:29:13,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5088 states. [2020-07-20 12:29:13,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5088 states to 5088 states and 8265 transitions. [2020-07-20 12:29:13,295 INFO L78 Accepts]: Start accepts. Automaton has 5088 states and 8265 transitions. Word has length 475 [2020-07-20 12:29:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:13,296 INFO L479 AbstractCegarLoop]: Abstraction has 5088 states and 8265 transitions. [2020-07-20 12:29:13,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand 5088 states and 8265 transitions. [2020-07-20 12:29:13,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 12:29:13,316 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:13,316 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] [2020-07-20 12:29:13,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:13,532 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:13,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1481331460, now seen corresponding path program 1 times [2020-07-20 12:29:13,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:13,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448911676] [2020-07-20 12:29:13,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:14,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:14,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 2916 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:14,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:14,181 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 12:29:14,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:14,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448911676] [2020-07-20 12:29:14,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:14,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:14,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489242215] [2020-07-20 12:29:14,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:14,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:14,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:14,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:14,184 INFO L87 Difference]: Start difference. First operand 5088 states and 8265 transitions. Second operand 3 states. [2020-07-20 12:29:14,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:14,543 INFO L93 Difference]: Finished difference Result 14492 states and 23381 transitions. [2020-07-20 12:29:14,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:14,544 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 476 [2020-07-20 12:29:14,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:14,597 INFO L225 Difference]: With dead ends: 14492 [2020-07-20 12:29:14,598 INFO L226 Difference]: Without dead ends: 9793 [2020-07-20 12:29:14,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 474 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 12:29:14,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9793 states. [2020-07-20 12:29:14,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9793 to 5140. [2020-07-20 12:29:14,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5140 states. [2020-07-20 12:29:15,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5140 states to 5140 states and 8345 transitions. [2020-07-20 12:29:15,007 INFO L78 Accepts]: Start accepts. Automaton has 5140 states and 8345 transitions. Word has length 476 [2020-07-20 12:29:15,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:15,008 INFO L479 AbstractCegarLoop]: Abstraction has 5140 states and 8345 transitions. [2020-07-20 12:29:15,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:15,008 INFO L276 IsEmpty]: Start isEmpty. Operand 5140 states and 8345 transitions. [2020-07-20 12:29:15,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-20 12:29:15,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:15,022 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] [2020-07-20 12:29:15,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:15,238 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:15,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:15,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1284388703, now seen corresponding path program 1 times [2020-07-20 12:29:15,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:15,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448314592] [2020-07-20 12:29:15,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:29:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:15,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 2917 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:15,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:16,373 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 12:29:16,374 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:16,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448314592] [2020-07-20 12:29:16,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:16,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:16,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936180686] [2020-07-20 12:29:16,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:16,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:16,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:16,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:16,378 INFO L87 Difference]: Start difference. First operand 5140 states and 8345 transitions. Second operand 3 states. [2020-07-20 12:29:16,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:16,848 INFO L93 Difference]: Finished difference Result 15000 states and 24286 transitions. [2020-07-20 12:29:16,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:16,849 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-20 12:29:16,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:16,905 INFO L225 Difference]: With dead ends: 15000 [2020-07-20 12:29:16,906 INFO L226 Difference]: Without dead ends: 10091 [2020-07-20 12:29:16,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 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 12:29:16,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10091 states. [2020-07-20 12:29:17,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10091 to 10034. [2020-07-20 12:29:17,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10034 states. [2020-07-20 12:29:17,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10034 states to 10034 states and 16216 transitions. [2020-07-20 12:29:17,329 INFO L78 Accepts]: Start accepts. Automaton has 10034 states and 16216 transitions. Word has length 477 [2020-07-20 12:29:17,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:17,329 INFO L479 AbstractCegarLoop]: Abstraction has 10034 states and 16216 transitions. [2020-07-20 12:29:17,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:17,330 INFO L276 IsEmpty]: Start isEmpty. Operand 10034 states and 16216 transitions. [2020-07-20 12:29:17,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-20 12:29:17,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:17,357 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] [2020-07-20 12:29:17,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:17,573 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:17,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:17,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1744646596, now seen corresponding path program 1 times [2020-07-20 12:29:17,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:17,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596404247] [2020-07-20 12:29:17,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:18,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:18,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 2919 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:18,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:18,364 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 12:29:18,364 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:18,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596404247] [2020-07-20 12:29:18,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:18,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:18,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247448651] [2020-07-20 12:29:18,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:18,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:18,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:18,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:18,367 INFO L87 Difference]: Start difference. First operand 10034 states and 16216 transitions. Second operand 3 states. [2020-07-20 12:29:18,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:18,859 INFO L93 Difference]: Finished difference Result 28642 states and 46004 transitions. [2020-07-20 12:29:18,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:18,859 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-20 12:29:18,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:18,906 INFO L225 Difference]: With dead ends: 28642 [2020-07-20 12:29:18,907 INFO L226 Difference]: Without dead ends: 19345 [2020-07-20 12:29:18,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 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 12:29:18,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19345 states. [2020-07-20 12:29:19,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19345 to 10192. [2020-07-20 12:29:19,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10192 states. [2020-07-20 12:29:19,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10192 states to 10192 states and 16454 transitions. [2020-07-20 12:29:19,480 INFO L78 Accepts]: Start accepts. Automaton has 10192 states and 16454 transitions. Word has length 477 [2020-07-20 12:29:19,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:19,484 INFO L479 AbstractCegarLoop]: Abstraction has 10192 states and 16454 transitions. [2020-07-20 12:29:19,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:19,485 INFO L276 IsEmpty]: Start isEmpty. Operand 10192 states and 16454 transitions. [2020-07-20 12:29:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 12:29:19,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:19,511 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] [2020-07-20 12:29:19,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:19,725 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:19,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:19,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1622315691, now seen corresponding path program 1 times [2020-07-20 12:29:19,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:19,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254822047] [2020-07-20 12:29:19,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:20,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:20,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 2920 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:20,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:20,281 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 12:29:20,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:20,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254822047] [2020-07-20 12:29:20,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:20,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:20,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005938542] [2020-07-20 12:29:20,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:20,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:20,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:20,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:20,284 INFO L87 Difference]: Start difference. First operand 10192 states and 16454 transitions. Second operand 3 states. [2020-07-20 12:29:20,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:20,661 INFO L93 Difference]: Finished difference Result 28856 states and 46283 transitions. [2020-07-20 12:29:20,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:20,661 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 12:29:20,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:20,831 INFO L225 Difference]: With dead ends: 28856 [2020-07-20 12:29:20,831 INFO L226 Difference]: Without dead ends: 19535 [2020-07-20 12:29:20,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 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 12:29:20,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19535 states. [2020-07-20 12:29:21,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19535 to 10382. [2020-07-20 12:29:21,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10382 states. [2020-07-20 12:29:21,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10382 states to 10382 states and 16696 transitions. [2020-07-20 12:29:21,292 INFO L78 Accepts]: Start accepts. Automaton has 10382 states and 16696 transitions. Word has length 478 [2020-07-20 12:29:21,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:21,292 INFO L479 AbstractCegarLoop]: Abstraction has 10382 states and 16696 transitions. [2020-07-20 12:29:21,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:21,292 INFO L276 IsEmpty]: Start isEmpty. Operand 10382 states and 16696 transitions. [2020-07-20 12:29:21,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 12:29:21,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:21,315 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] [2020-07-20 12:29:21,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:21,530 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:21,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:21,531 INFO L82 PathProgramCache]: Analyzing trace with hash -916095642, now seen corresponding path program 1 times [2020-07-20 12:29:21,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:21,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234359627] [2020-07-20 12:29:21,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:21,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:22,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 2920 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:22,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:22,296 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 12:29:22,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:22,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234359627] [2020-07-20 12:29:22,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:22,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:22,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371106617] [2020-07-20 12:29:22,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:22,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:22,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:22,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:22,298 INFO L87 Difference]: Start difference. First operand 10382 states and 16696 transitions. Second operand 3 states. [2020-07-20 12:29:22,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:22,771 INFO L93 Difference]: Finished difference Result 30381 states and 48738 transitions. [2020-07-20 12:29:22,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:22,771 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-20 12:29:22,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:22,824 INFO L225 Difference]: With dead ends: 30381 [2020-07-20 12:29:22,824 INFO L226 Difference]: Without dead ends: 20373 [2020-07-20 12:29:22,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 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 12:29:22,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20373 states. [2020-07-20 12:29:23,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20373 to 20316. [2020-07-20 12:29:23,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20316 states. [2020-07-20 12:29:23,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20316 states to 20316 states and 32507 transitions. [2020-07-20 12:29:23,691 INFO L78 Accepts]: Start accepts. Automaton has 20316 states and 32507 transitions. Word has length 479 [2020-07-20 12:29:23,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:23,692 INFO L479 AbstractCegarLoop]: Abstraction has 20316 states and 32507 transitions. [2020-07-20 12:29:23,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:23,692 INFO L276 IsEmpty]: Start isEmpty. Operand 20316 states and 32507 transitions. [2020-07-20 12:29:23,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 12:29:23,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:23,742 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] [2020-07-20 12:29:23,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:23,955 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:23,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:23,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1111574185, now seen corresponding path program 1 times [2020-07-20 12:29:23,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:23,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369862389] [2020-07-20 12:29:23,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:24,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:24,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 2921 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:29:25,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:25,152 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 12:29:25,152 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:25,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369862389] [2020-07-20 12:29:25,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:25,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:29:25,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133971077] [2020-07-20 12:29:25,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:29:25,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:25,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:29:25,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:29:25,155 INFO L87 Difference]: Start difference. First operand 20316 states and 32507 transitions. Second operand 4 states. [2020-07-20 12:29:26,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:26,845 INFO L93 Difference]: Finished difference Result 53579 states and 84878 transitions. [2020-07-20 12:29:26,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:29:26,846 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-20 12:29:26,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:26,944 INFO L225 Difference]: With dead ends: 53579 [2020-07-20 12:29:26,944 INFO L226 Difference]: Without dead ends: 37666 [2020-07-20 12:29:26,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 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 12:29:27,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37666 states. [2020-07-20 12:29:27,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37666 to 23004. [2020-07-20 12:29:27,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23004 states. [2020-07-20 12:29:27,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23004 states to 23004 states and 37196 transitions. [2020-07-20 12:29:27,797 INFO L78 Accepts]: Start accepts. Automaton has 23004 states and 37196 transitions. Word has length 479 [2020-07-20 12:29:27,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:27,798 INFO L479 AbstractCegarLoop]: Abstraction has 23004 states and 37196 transitions. [2020-07-20 12:29:27,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:29:27,798 INFO L276 IsEmpty]: Start isEmpty. Operand 23004 states and 37196 transitions. [2020-07-20 12:29:27,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 12:29:27,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:27,823 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] [2020-07-20 12:29:28,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:28,032 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:28,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:28,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1521048497, now seen corresponding path program 1 times [2020-07-20 12:29:28,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:28,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215843535] [2020-07-20 12:29:28,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:28,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:28,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 2928 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:28,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:28,812 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 12:29:28,812 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:28,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215843535] [2020-07-20 12:29:28,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:28,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:28,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274240716] [2020-07-20 12:29:28,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:28,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:28,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:28,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:28,814 INFO L87 Difference]: Start difference. First operand 23004 states and 37196 transitions. Second operand 3 states. [2020-07-20 12:29:29,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:29,678 INFO L93 Difference]: Finished difference Result 54945 states and 86965 transitions. [2020-07-20 12:29:29,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:29,679 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 482 [2020-07-20 12:29:29,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:29,736 INFO L225 Difference]: With dead ends: 54945 [2020-07-20 12:29:29,736 INFO L226 Difference]: Without dead ends: 39012 [2020-07-20 12:29:29,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 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 12:29:29,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39012 states. [2020-07-20 12:29:30,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39012 to 23451. [2020-07-20 12:29:30,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23451 states. [2020-07-20 12:29:30,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23451 states to 23451 states and 37871 transitions. [2020-07-20 12:29:30,857 INFO L78 Accepts]: Start accepts. Automaton has 23451 states and 37871 transitions. Word has length 482 [2020-07-20 12:29:30,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:30,858 INFO L479 AbstractCegarLoop]: Abstraction has 23451 states and 37871 transitions. [2020-07-20 12:29:30,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:30,858 INFO L276 IsEmpty]: Start isEmpty. Operand 23451 states and 37871 transitions. [2020-07-20 12:29:30,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 12:29:30,880 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:30,880 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] [2020-07-20 12:29:31,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:31,088 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:31,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:31,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1865472944, now seen corresponding path program 1 times [2020-07-20 12:29:31,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:31,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744631468] [2020-07-20 12:29:31,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:31,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:31,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 2929 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:31,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:31,687 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 12:29:31,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:31,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744631468] [2020-07-20 12:29:31,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:31,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:31,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923289741] [2020-07-20 12:29:31,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:31,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:31,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:31,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:31,689 INFO L87 Difference]: Start difference. First operand 23451 states and 37871 transitions. Second operand 3 states. [2020-07-20 12:29:32,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:32,901 INFO L93 Difference]: Finished difference Result 55674 states and 88014 transitions. [2020-07-20 12:29:32,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:32,902 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-20 12:29:32,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:32,954 INFO L225 Difference]: With dead ends: 55674 [2020-07-20 12:29:32,954 INFO L226 Difference]: Without dead ends: 39627 [2020-07-20 12:29:32,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 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 12:29:33,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39627 states. [2020-07-20 12:29:33,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39627 to 24098. [2020-07-20 12:29:33,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24098 states. [2020-07-20 12:29:33,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24098 states to 24098 states and 38811 transitions. [2020-07-20 12:29:33,833 INFO L78 Accepts]: Start accepts. Automaton has 24098 states and 38811 transitions. Word has length 483 [2020-07-20 12:29:33,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:33,834 INFO L479 AbstractCegarLoop]: Abstraction has 24098 states and 38811 transitions. [2020-07-20 12:29:33,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:33,834 INFO L276 IsEmpty]: Start isEmpty. Operand 24098 states and 38811 transitions. [2020-07-20 12:29:33,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-20 12:29:33,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:33,860 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] [2020-07-20 12:29:34,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:34,074 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:34,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:34,075 INFO L82 PathProgramCache]: Analyzing trace with hash -2139647005, now seen corresponding path program 1 times [2020-07-20 12:29:34,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:34,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091640897] [2020-07-20 12:29:34,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:29:34,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:34,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 2930 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:34,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:34,815 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 12:29:34,816 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:34,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091640897] [2020-07-20 12:29:34,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:34,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:34,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340745736] [2020-07-20 12:29:34,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:34,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:34,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:34,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:34,818 INFO L87 Difference]: Start difference. First operand 24098 states and 38811 transitions. Second operand 3 states. [2020-07-20 12:29:35,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:35,930 INFO L93 Difference]: Finished difference Result 56586 states and 89198 transitions. [2020-07-20 12:29:35,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:35,931 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 484 [2020-07-20 12:29:35,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:36,016 INFO L225 Difference]: With dead ends: 56586 [2020-07-20 12:29:36,016 INFO L226 Difference]: Without dead ends: 40481 [2020-07-20 12:29:36,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 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 12:29:36,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40481 states. [2020-07-20 12:29:38,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40481 to 24952. [2020-07-20 12:29:38,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24952 states. [2020-07-20 12:29:38,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24952 states to 24952 states and 39873 transitions. [2020-07-20 12:29:38,833 INFO L78 Accepts]: Start accepts. Automaton has 24952 states and 39873 transitions. Word has length 484 [2020-07-20 12:29:38,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:38,834 INFO L479 AbstractCegarLoop]: Abstraction has 24952 states and 39873 transitions. [2020-07-20 12:29:38,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:38,834 INFO L276 IsEmpty]: Start isEmpty. Operand 24952 states and 39873 transitions. [2020-07-20 12:29:38,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 12:29:38,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:38,866 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] [2020-07-20 12:29:39,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:39,081 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:39,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:39,082 INFO L82 PathProgramCache]: Analyzing trace with hash -362148267, now seen corresponding path program 1 times [2020-07-20 12:29:39,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:39,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952822994] [2020-07-20 12:29:39,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:39,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:39,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 2941 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:29:39,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:39,770 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 12:29:39,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:39,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952822994] [2020-07-20 12:29:39,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:39,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:29:39,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127718183] [2020-07-20 12:29:39,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:29:39,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:39,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:29:39,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:29:39,773 INFO L87 Difference]: Start difference. First operand 24952 states and 39873 transitions. Second operand 4 states. [2020-07-20 12:29:41,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:41,609 INFO L93 Difference]: Finished difference Result 73898 states and 118005 transitions. [2020-07-20 12:29:41,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:29:41,610 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 485 [2020-07-20 12:29:41,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:41,691 INFO L225 Difference]: With dead ends: 73898 [2020-07-20 12:29:41,692 INFO L226 Difference]: Without dead ends: 49111 [2020-07-20 12:29:41,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 482 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 12:29:41,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49111 states. [2020-07-20 12:29:43,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49111 to 49060. [2020-07-20 12:29:43,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49060 states. [2020-07-20 12:29:43,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49060 states to 49060 states and 77991 transitions. [2020-07-20 12:29:43,907 INFO L78 Accepts]: Start accepts. Automaton has 49060 states and 77991 transitions. Word has length 485 [2020-07-20 12:29:43,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:43,907 INFO L479 AbstractCegarLoop]: Abstraction has 49060 states and 77991 transitions. [2020-07-20 12:29:43,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:29:43,908 INFO L276 IsEmpty]: Start isEmpty. Operand 49060 states and 77991 transitions. [2020-07-20 12:29:43,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 12:29:43,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:43,951 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] [2020-07-20 12:29:44,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:44,152 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:44,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:44,153 INFO L82 PathProgramCache]: Analyzing trace with hash -412272428, now seen corresponding path program 1 times [2020-07-20 12:29:44,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:44,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649149488] [2020-07-20 12:29:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:44,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:44,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 2944 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:44,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:44,820 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 12:29:44,820 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:44,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649149488] [2020-07-20 12:29:44,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:44,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:44,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305386594] [2020-07-20 12:29:44,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:44,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:44,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:44,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:44,822 INFO L87 Difference]: Start difference. First operand 49060 states and 77991 transitions. Second operand 3 states. [2020-07-20 12:29:49,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:49,200 INFO L93 Difference]: Finished difference Result 144777 states and 229911 transitions. [2020-07-20 12:29:49,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:49,201 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-20 12:29:49,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:49,333 INFO L225 Difference]: With dead ends: 144777 [2020-07-20 12:29:49,333 INFO L226 Difference]: Without dead ends: 96662 [2020-07-20 12:29:49,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 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 12:29:49,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96662 states. [2020-07-20 12:29:53,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96662 to 96608. [2020-07-20 12:29:53,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96608 states. [2020-07-20 12:29:53,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96608 states to 96608 states and 152849 transitions. [2020-07-20 12:29:53,479 INFO L78 Accepts]: Start accepts. Automaton has 96608 states and 152849 transitions. Word has length 487 [2020-07-20 12:29:53,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:53,479 INFO L479 AbstractCegarLoop]: Abstraction has 96608 states and 152849 transitions. [2020-07-20 12:29:53,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:53,480 INFO L276 IsEmpty]: Start isEmpty. Operand 96608 states and 152849 transitions. [2020-07-20 12:29:53,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 12:29:53,558 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:53,558 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] [2020-07-20 12:29:53,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:53,774 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:53,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:53,775 INFO L82 PathProgramCache]: Analyzing trace with hash 999482083, now seen corresponding path program 1 times [2020-07-20 12:29:53,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:53,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461963151] [2020-07-20 12:29:53,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:29:54,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:54,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 2946 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:54,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:54,412 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 12:29:54,412 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:54,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461963151] [2020-07-20 12:29:54,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:54,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:54,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62806008] [2020-07-20 12:29:54,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:54,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:54,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:54,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:54,415 INFO L87 Difference]: Start difference. First operand 96608 states and 152849 transitions. Second operand 3 states. [2020-07-20 12:30:02,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:30:02,668 INFO L93 Difference]: Finished difference Result 288371 states and 455963 transitions. [2020-07-20 12:30:02,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:30:02,916 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 488 [2020-07-20 12:30:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:30:03,150 INFO L225 Difference]: With dead ends: 288371 [2020-07-20 12:30:03,150 INFO L226 Difference]: Without dead ends: 192273 [2020-07-20 12:30:03,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 486 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 12:30:03,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192273 states. [2020-07-20 12:30:07,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192273 to 96808. [2020-07-20 12:30:07,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96808 states. [2020-07-20 12:30:07,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96808 states to 96808 states and 153143 transitions. [2020-07-20 12:30:07,911 INFO L78 Accepts]: Start accepts. Automaton has 96808 states and 153143 transitions. Word has length 488 [2020-07-20 12:30:07,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:30:07,912 INFO L479 AbstractCegarLoop]: Abstraction has 96808 states and 153143 transitions. [2020-07-20 12:30:07,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:30:07,912 INFO L276 IsEmpty]: Start isEmpty. Operand 96808 states and 153143 transitions. [2020-07-20 12:30:08,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 12:30:08,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:30:08,008 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] [2020-07-20 12:30:08,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:08,209 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:30:08,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:30:08,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1335144281, now seen corresponding path program 1 times [2020-07-20 12:30:08,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:30:08,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489764020] [2020-07-20 12:30:08,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:08,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:30:08,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 2947 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:30:08,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:30:08,962 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 12:30:08,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:30:08,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489764020] [2020-07-20 12:30:08,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:30:08,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:30:08,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24566914] [2020-07-20 12:30:08,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:30:08,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:30:08,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:30:08,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:30:08,964 INFO L87 Difference]: Start difference. First operand 96808 states and 153143 transitions. Second operand 3 states. [2020-07-20 12:30:17,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:30:18,000 INFO L93 Difference]: Finished difference Result 287850 states and 455147 transitions. [2020-07-20 12:30:18,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:30:18,000 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-20 12:30:18,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:30:18,228 INFO L225 Difference]: With dead ends: 287850 [2020-07-20 12:30:18,228 INFO L226 Difference]: Without dead ends: 192174 [2020-07-20 12:30:18,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 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 12:30:18,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192174 states. [2020-07-20 12:30:29,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192174 to 192125. [2020-07-20 12:30:29,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192125 states. [2020-07-20 12:30:30,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192125 states to 192125 states and 302630 transitions. [2020-07-20 12:30:30,012 INFO L78 Accepts]: Start accepts. Automaton has 192125 states and 302630 transitions. Word has length 489 [2020-07-20 12:30:30,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:30:30,012 INFO L479 AbstractCegarLoop]: Abstraction has 192125 states and 302630 transitions. [2020-07-20 12:30:30,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:30:30,012 INFO L276 IsEmpty]: Start isEmpty. Operand 192125 states and 302630 transitions. [2020-07-20 12:30:30,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 12:30:30,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:30:30,183 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] [2020-07-20 12:30:30,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:30,384 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:30:30,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:30:30,385 INFO L82 PathProgramCache]: Analyzing trace with hash -95512268, now seen corresponding path program 1 times [2020-07-20 12:30:30,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:30:30,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563010873] [2020-07-20 12:30:30,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:30,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:30:30,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 2949 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:30:30,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:30:31,446 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 12:30:31,447 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:30:31,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563010873] [2020-07-20 12:30:31,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:30:31,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:30:31,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099836997] [2020-07-20 12:30:31,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:30:31,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:30:31,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:30:31,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:30:31,449 INFO L87 Difference]: Start difference. First operand 192125 states and 302630 transitions. Second operand 3 states. [2020-07-20 12:30:49,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:30:49,936 INFO L93 Difference]: Finished difference Result 573827 states and 903462 transitions. [2020-07-20 12:30:49,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:30:49,936 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-20 12:30:49,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:30:50,401 INFO L225 Difference]: With dead ends: 573827 [2020-07-20 12:30:50,402 INFO L226 Difference]: Without dead ends: 382967 [2020-07-20 12:30:50,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 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 12:30:51,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382967 states. [2020-07-20 12:31:06,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382967 to 192793. [2020-07-20 12:31:06,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192793 states. [2020-07-20 12:31:06,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192793 states to 192793 states and 303604 transitions. [2020-07-20 12:31:06,678 INFO L78 Accepts]: Start accepts. Automaton has 192793 states and 303604 transitions. Word has length 489 [2020-07-20 12:31:06,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:31:06,678 INFO L479 AbstractCegarLoop]: Abstraction has 192793 states and 303604 transitions. [2020-07-20 12:31:06,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:31:06,678 INFO L276 IsEmpty]: Start isEmpty. Operand 192793 states and 303604 transitions. [2020-07-20 12:31:07,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 12:31:07,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:31:07,507 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] [2020-07-20 12:31:07,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:31:07,708 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:31:07,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:31:07,709 INFO L82 PathProgramCache]: Analyzing trace with hash -993288718, now seen corresponding path program 1 times [2020-07-20 12:31:07,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:31:07,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324236695] [2020-07-20 12:31:07,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:31:08,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:31:08,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 2950 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:31:08,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:31:08,276 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 12:31:08,276 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:31:08,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324236695] [2020-07-20 12:31:08,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:31:08,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:31:08,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634004573] [2020-07-20 12:31:08,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:31:08,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:31:08,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:31:08,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:31:08,278 INFO L87 Difference]: Start difference. First operand 192793 states and 303604 transitions. Second operand 3 states. [2020-07-20 12:31:29,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:31:29,028 INFO L93 Difference]: Finished difference Result 574572 states and 904383 transitions. [2020-07-20 12:31:29,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:31:29,029 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 12:31:29,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:31:29,522 INFO L225 Difference]: With dead ends: 574572 [2020-07-20 12:31:29,522 INFO L226 Difference]: Without dead ends: 383763 [2020-07-20 12:31:29,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 488 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 12:31:30,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383763 states. [2020-07-20 12:31:47,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383763 to 193589. [2020-07-20 12:31:47,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193589 states. [2020-07-20 12:31:47,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193589 states to 193589 states and 304616 transitions. [2020-07-20 12:31:47,638 INFO L78 Accepts]: Start accepts. Automaton has 193589 states and 304616 transitions. Word has length 490 [2020-07-20 12:31:47,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:31:47,639 INFO L479 AbstractCegarLoop]: Abstraction has 193589 states and 304616 transitions. [2020-07-20 12:31:47,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:31:47,639 INFO L276 IsEmpty]: Start isEmpty. Operand 193589 states and 304616 transitions. [2020-07-20 12:31:48,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 12:31:48,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:31:48,384 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] [2020-07-20 12:31:48,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:31:48,585 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:31:48,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:31:48,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1720653378, now seen corresponding path program 1 times [2020-07-20 12:31:48,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:31:48,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403251981] [2020-07-20 12:31:48,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:31:49,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:31:49,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 2950 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:31:49,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:31:49,257 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 12:31:49,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:31:49,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [403251981] [2020-07-20 12:31:49,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:31:49,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:31:49,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044764183] [2020-07-20 12:31:49,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:31:49,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:31:49,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:31:49,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:31:49,260 INFO L87 Difference]: Start difference. First operand 193589 states and 304616 transitions. Second operand 3 states. [2020-07-20 12:32:11,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:32:11,991 INFO L93 Difference]: Finished difference Result 569913 states and 896437 transitions. [2020-07-20 12:32:11,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:32:11,991 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 491 [2020-07-20 12:32:11,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:32:12,462 INFO L225 Difference]: With dead ends: 569913 [2020-07-20 12:32:12,462 INFO L226 Difference]: Without dead ends: 382976 [2020-07-20 12:32:12,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 489 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 12:32:12,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382976 states. [2020-07-20 12:32:44,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382976 to 382929. [2020-07-20 12:32:44,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382929 states. [2020-07-20 12:32:45,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382929 states to 382929 states and 600149 transitions. [2020-07-20 12:32:45,140 INFO L78 Accepts]: Start accepts. Automaton has 382929 states and 600149 transitions. Word has length 491 [2020-07-20 12:32:45,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:32:45,141 INFO L479 AbstractCegarLoop]: Abstraction has 382929 states and 600149 transitions. [2020-07-20 12:32:45,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:32:45,141 INFO L276 IsEmpty]: Start isEmpty. Operand 382929 states and 600149 transitions. [2020-07-20 12:32:45,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 12:32:45,551 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:32:45,551 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] [2020-07-20 12:32:45,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:45,752 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:32:45,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:32:45,753 INFO L82 PathProgramCache]: Analyzing trace with hash 216716609, now seen corresponding path program 1 times [2020-07-20 12:32:45,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:32:45,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243844286] [2020-07-20 12:32:45,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:46,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:32:46,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 2951 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:32:46,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:32:46,847 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 12:32:46,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:32:46,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243844286] [2020-07-20 12:32:46,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:32:46,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:32:46,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235771826] [2020-07-20 12:32:46,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:32:46,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:32:46,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:32:46,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:32:46,849 INFO L87 Difference]: Start difference. First operand 382929 states and 600149 transitions. Second operand 4 states. [2020-07-20 12:33:34,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:33:34,473 INFO L93 Difference]: Finished difference Result 1043158 states and 1625859 transitions. [2020-07-20 12:33:34,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:33:34,473 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 491 [2020-07-20 12:33:34,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:33:35,607 INFO L225 Difference]: With dead ends: 1043158 [2020-07-20 12:33:35,607 INFO L226 Difference]: Without dead ends: 732306 [2020-07-20 12:33:35,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 488 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 12:33:36,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732306 states. [2020-07-20 12:34:15,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 732306 to 451903. [2020-07-20 12:34:15,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 451903 states. [2020-07-20 12:34:15,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451903 states to 451903 states and 715336 transitions. [2020-07-20 12:34:15,993 INFO L78 Accepts]: Start accepts. Automaton has 451903 states and 715336 transitions. Word has length 491 [2020-07-20 12:34:15,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:34:15,993 INFO L479 AbstractCegarLoop]: Abstraction has 451903 states and 715336 transitions. [2020-07-20 12:34:15,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:34:15,993 INFO L276 IsEmpty]: Start isEmpty. Operand 451903 states and 715336 transitions. [2020-07-20 12:34:16,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2020-07-20 12:34:16,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:34:16,536 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] [2020-07-20 12:34:16,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:34:16,737 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:34:16,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:34:16,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1952989886, now seen corresponding path program 1 times [2020-07-20 12:34:16,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:34:16,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431501394] [2020-07-20 12:34:16,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:34:17,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:34:17,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 2958 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:34:17,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:34:18,139 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 12:34:18,139 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:34:18,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431501394] [2020-07-20 12:34:18,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:34:18,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:34:18,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588064113] [2020-07-20 12:34:18,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:34:18,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:34:18,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:34:18,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:34:18,141 INFO L87 Difference]: Start difference. First operand 451903 states and 715336 transitions. Second operand 3 states. [2020-07-20 12:35:10,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:35:10,073 INFO L93 Difference]: Finished difference Result 1080460 states and 1684421 transitions. [2020-07-20 12:35:10,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:35:10,073 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 494 [2020-07-20 12:35:10,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:35:11,217 INFO L225 Difference]: With dead ends: 1080460 [2020-07-20 12:35:11,217 INFO L226 Difference]: Without dead ends: 765670 [2020-07-20 12:35:11,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 492 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 12:35:12,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 765670 states. [2020-07-20 12:36:01,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 765670 to 465760. [2020-07-20 12:36:01,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 465760 states. [2020-07-20 12:36:02,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465760 states to 465760 states and 735796 transitions. [2020-07-20 12:36:02,199 INFO L78 Accepts]: Start accepts. Automaton has 465760 states and 735796 transitions. Word has length 494 [2020-07-20 12:36:02,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:02,200 INFO L479 AbstractCegarLoop]: Abstraction has 465760 states and 735796 transitions. [2020-07-20 12:36:02,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:02,200 INFO L276 IsEmpty]: Start isEmpty. Operand 465760 states and 735796 transitions. [2020-07-20 12:36:02,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 12:36:02,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:02,770 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] [2020-07-20 12:36:02,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:02,971 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:02,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:02,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1669022976, now seen corresponding path program 1 times [2020-07-20 12:36:02,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:02,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574813462] [2020-07-20 12:36:02,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:03,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:03,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 2959 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:03,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:03,530 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 12:36:03,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:03,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574813462] [2020-07-20 12:36:03,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:03,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:03,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431060448] [2020-07-20 12:36:03,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:03,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:03,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:03,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:03,533 INFO L87 Difference]: Start difference. First operand 465760 states and 735796 transitions. Second operand 3 states. [2020-07-20 12:37:01,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:01,764 INFO L93 Difference]: Finished difference Result 1104671 states and 1719110 transitions. [2020-07-20 12:37:01,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:37:01,765 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 495 [2020-07-20 12:37:01,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:03,497 INFO L225 Difference]: With dead ends: 1104671 [2020-07-20 12:37:03,497 INFO L226 Difference]: Without dead ends: 783309 [2020-07-20 12:37:03,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 493 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 12:37:04,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783309 states. [2020-07-20 12:37:46,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783309 to 485817. [2020-07-20 12:37:46,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 485817 states. [2020-07-20 12:37:48,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485817 states to 485817 states and 764192 transitions. [2020-07-20 12:37:48,456 INFO L78 Accepts]: Start accepts. Automaton has 485817 states and 764192 transitions. Word has length 495 [2020-07-20 12:37:48,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:48,456 INFO L479 AbstractCegarLoop]: Abstraction has 485817 states and 764192 transitions. [2020-07-20 12:37:48,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:37:48,456 INFO L276 IsEmpty]: Start isEmpty. Operand 485817 states and 764192 transitions. [2020-07-20 12:37:48,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 12:37:48,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:48,972 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 12:37:49,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:49,173 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:49,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:49,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1983402354, now seen corresponding path program 1 times [2020-07-20 12:37:49,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:49,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517944404] [2020-07-20 12:37:49,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:49,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:49,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 2960 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:49,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:49,755 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 12:37:49,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:49,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517944404] [2020-07-20 12:37:49,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:49,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:49,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298455157] [2020-07-20 12:37:49,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:49,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:49,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:49,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:49,758 INFO L87 Difference]: Start difference. First operand 485817 states and 764192 transitions. Second operand 3 states. [2020-07-20 12:38:49,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:38:49,512 INFO L93 Difference]: Finished difference Result 1136325 states and 1760992 transitions. [2020-07-20 12:38:49,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:38:49,512 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-20 12:38:49,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:38:50,743 INFO L225 Difference]: With dead ends: 1136325 [2020-07-20 12:38:50,743 INFO L226 Difference]: Without dead ends: 814048 [2020-07-20 12:38:51,067 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 12:38:51,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 814048 states. [2020-07-20 12:39:38,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 814048 to 516556. [2020-07-20 12:39:38,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 516556 states. [2020-07-20 12:39:40,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516556 states to 516556 states and 803821 transitions. [2020-07-20 12:39:40,598 INFO L78 Accepts]: Start accepts. Automaton has 516556 states and 803821 transitions. Word has length 496 [2020-07-20 12:39:40,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:39:40,599 INFO L479 AbstractCegarLoop]: Abstraction has 516556 states and 803821 transitions. [2020-07-20 12:39:40,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:39:40,599 INFO L276 IsEmpty]: Start isEmpty. Operand 516556 states and 803821 transitions. [2020-07-20 12:39:41,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-20 12:39:41,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:39:41,189 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] [2020-07-20 12:39:41,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:39:41,390 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:39:41,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:39:41,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1501263731, now seen corresponding path program 1 times [2020-07-20 12:39:41,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:39:41,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22248857] [2020-07-20 12:39:41,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:39:41,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:39:41,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 2961 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:39:41,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:39:42,013 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 12:39:42,013 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:39:42,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22248857] [2020-07-20 12:39:42,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:39:42,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:39:42,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84625464] [2020-07-20 12:39:42,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:39:42,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:39:42,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:39:42,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:39:42,015 INFO L87 Difference]: Start difference. First operand 516556 states and 803821 transitions. Second operand 4 states.