/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 23:04:29,119 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 23:04:29,123 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 23:04:29,144 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 23:04:29,144 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 23:04:29,147 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 23:04:29,149 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 23:04:29,161 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 23:04:29,165 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 23:04:29,167 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 23:04:29,171 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 23:04:29,173 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 23:04:29,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 23:04:29,176 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 23:04:29,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 23:04:29,180 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 23:04:29,181 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 23:04:29,182 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 23:04:29,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 23:04:29,190 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 23:04:29,196 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 23:04:29,200 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 23:04:29,202 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 23:04:29,203 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 23:04:29,206 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 23:04:29,212 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 23:04:29,214 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 23:04:29,214 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 23:04:29,215 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 23:04:29,216 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 23:04:29,216 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 23:04:29,217 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 23:04:29,217 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 23:04:29,218 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 23:04:29,218 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 23:04:29,219 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 23:04:29,220 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 23:04:29,258 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 23:04:29,262 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 23:04:29,263 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 23:04:29,265 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 23:04:29,266 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 23:04:29,266 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 23:04:29,266 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 23:04:29,266 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 23:04:29,266 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 23:04:29,267 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 23:04:29,267 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 23:04:29,267 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 23:04:29,267 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 23:04:29,267 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 23:04:29,268 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 23:04:29,268 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 23:04:29,268 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 23:04:29,270 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 23:04:29,270 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 23:04:29,270 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 23:04:29,271 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 23:04:29,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 23:04:29,271 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 23:04:29,271 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 23:04:29,272 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 23:04:29,594 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 23:04:29,608 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 23:04:29,612 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 23:04:29,616 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 23:04:29,616 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 23:04:29,618 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:04:29,699 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ce1d40f6/7c7ca33b7b484be38ee2e51dd093ebb5/FLAG8225ba09a [2020-07-20 23:04:30,288 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 23:04:30,289 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:04:30,310 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ce1d40f6/7c7ca33b7b484be38ee2e51dd093ebb5/FLAG8225ba09a [2020-07-20 23:04:30,514 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ce1d40f6/7c7ca33b7b484be38ee2e51dd093ebb5 [2020-07-20 23:04:30,525 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 23:04:30,528 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 23:04:30,533 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 23:04:30,533 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 23:04:30,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 23:04:30,538 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:04:30" (1/1) ... [2020-07-20 23:04:30,541 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43417226 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:30, skipping insertion in model container [2020-07-20 23:04:30,541 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:04:30" (1/1) ... [2020-07-20 23:04:30,551 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 23:04:30,723 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 23:04:31,848 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:04:31,871 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 23:04:32,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:04:32,636 INFO L208 MainTranslator]: Completed translation [2020-07-20 23:04:32,637 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32 WrapperNode [2020-07-20 23:04:32,637 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 23:04:32,638 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 23:04:32,638 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 23:04:32,638 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 23:04:32,654 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,700 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,701 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,767 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,802 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,814 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (1/1) ... [2020-07-20 23:04:32,836 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 23:04:32,838 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 23:04:32,838 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 23:04:32,838 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 23:04:32,839 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (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 23:04:32,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 23:04:32,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 23:04:32,918 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 23:04:32,919 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 23:04:32,920 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 23:04:32,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 23:04:32,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 23:04:32,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 23:04:32,922 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 23:04:32,922 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 23:04:32,923 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 23:04:32,923 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 23:04:32,923 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 23:04:32,923 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 23:04:32,923 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 23:04:32,925 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 23:04:32,925 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 23:04:32,925 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 23:04:32,925 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 23:04:32,926 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 23:04:32,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 23:04:32,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 23:04:35,293 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 23:04:35,293 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 23:04:35,302 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:04:35 BoogieIcfgContainer [2020-07-20 23:04:35,303 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 23:04:35,304 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 23:04:35,304 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 23:04:35,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 23:04:35,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:04:30" (1/3) ... [2020-07-20 23:04:35,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efa1775 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:04:35, skipping insertion in model container [2020-07-20 23:04:35,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:04:32" (2/3) ... [2020-07-20 23:04:35,309 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efa1775 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:04:35, skipping insertion in model container [2020-07-20 23:04:35,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:04:35" (3/3) ... [2020-07-20 23:04:35,311 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:04:35,321 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 23:04:35,329 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 23:04:35,344 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 23:04:35,371 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 23:04:35,372 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 23:04:35,372 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 23:04:35,372 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 23:04:35,372 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 23:04:35,372 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 23:04:35,373 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 23:04:35,373 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 23:04:35,413 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states. [2020-07-20 23:04:35,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 23:04:35,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:35,442 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] [2020-07-20 23:04:35,443 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:35,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:35,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times [2020-07-20 23:04:35,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:35,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606043790] [2020-07-20 23:04:35,459 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:35,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:04:35,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:35,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 1246 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:04:35,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:36,298 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 23:04:36,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:36,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606043790] [2020-07-20 23:04:36,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:36,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:04:36,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349133875] [2020-07-20 23:04:36,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:04:36,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:36,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:04:36,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:04:36,325 INFO L87 Difference]: Start difference. First operand 808 states. Second operand 4 states. [2020-07-20 23:04:36,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:36,608 INFO L93 Difference]: Finished difference Result 2367 states and 4203 transitions. [2020-07-20 23:04:36,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 23:04:36,610 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-20 23:04:36,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:36,636 INFO L225 Difference]: With dead ends: 2367 [2020-07-20 23:04:36,636 INFO L226 Difference]: Without dead ends: 1568 [2020-07-20 23:04:36,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 327 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 23:04:36,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1568 states. [2020-07-20 23:04:36,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1568 to 1566. [2020-07-20 23:04:36,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1566 states. [2020-07-20 23:04:36,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1566 states to 1566 states and 2429 transitions. [2020-07-20 23:04:36,792 INFO L78 Accepts]: Start accepts. Automaton has 1566 states and 2429 transitions. Word has length 330 [2020-07-20 23:04:36,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:36,795 INFO L479 AbstractCegarLoop]: Abstraction has 1566 states and 2429 transitions. [2020-07-20 23:04:36,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:04:36,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1566 states and 2429 transitions. [2020-07-20 23:04:36,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 23:04:36,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:36,810 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] [2020-07-20 23:04:37,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:37,024 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:37,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:37,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1958326031, now seen corresponding path program 1 times [2020-07-20 23:04:37,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:37,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143571495] [2020-07-20 23:04:37,027 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:37,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:04:37,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:37,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 1247 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:37,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:37,602 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 23:04:37,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:37,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143571495] [2020-07-20 23:04:37,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:37,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:37,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596481651] [2020-07-20 23:04:37,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:37,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:37,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:37,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:37,612 INFO L87 Difference]: Start difference. First operand 1566 states and 2429 transitions. Second operand 3 states. [2020-07-20 23:04:37,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:37,797 INFO L93 Difference]: Finished difference Result 4500 states and 6949 transitions. [2020-07-20 23:04:37,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:37,798 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-20 23:04:37,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:37,816 INFO L225 Difference]: With dead ends: 4500 [2020-07-20 23:04:37,817 INFO L226 Difference]: Without dead ends: 3036 [2020-07-20 23:04:37,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 330 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 23:04:37,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3036 states. [2020-07-20 23:04:38,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3036 to 3034. [2020-07-20 23:04:38,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3034 states. [2020-07-20 23:04:38,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3034 states to 3034 states and 4675 transitions. [2020-07-20 23:04:38,019 INFO L78 Accepts]: Start accepts. Automaton has 3034 states and 4675 transitions. Word has length 332 [2020-07-20 23:04:38,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:38,020 INFO L479 AbstractCegarLoop]: Abstraction has 3034 states and 4675 transitions. [2020-07-20 23:04:38,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:38,020 INFO L276 IsEmpty]: Start isEmpty. Operand 3034 states and 4675 transitions. [2020-07-20 23:04:38,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 23:04:38,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:38,031 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] [2020-07-20 23:04:38,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:38,246 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:38,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:38,247 INFO L82 PathProgramCache]: Analyzing trace with hash 603442998, now seen corresponding path program 1 times [2020-07-20 23:04:38,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:38,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265802513] [2020-07-20 23:04:38,249 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:38,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:04:38,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:38,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:38,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:38,618 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 23:04:38,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:38,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265802513] [2020-07-20 23:04:38,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:38,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:38,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354546262] [2020-07-20 23:04:38,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:38,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:38,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:38,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:38,622 INFO L87 Difference]: Start difference. First operand 3034 states and 4675 transitions. Second operand 3 states. [2020-07-20 23:04:38,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:38,810 INFO L93 Difference]: Finished difference Result 9070 states and 13976 transitions. [2020-07-20 23:04:38,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:38,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-20 23:04:38,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:38,840 INFO L225 Difference]: With dead ends: 9070 [2020-07-20 23:04:38,840 INFO L226 Difference]: Without dead ends: 6051 [2020-07-20 23:04:38,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 330 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 23:04:38,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6051 states. [2020-07-20 23:04:38,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6051 to 3045. [2020-07-20 23:04:38,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3045 states. [2020-07-20 23:04:39,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3045 states to 3045 states and 4691 transitions. [2020-07-20 23:04:39,011 INFO L78 Accepts]: Start accepts. Automaton has 3045 states and 4691 transitions. Word has length 332 [2020-07-20 23:04:39,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:39,011 INFO L479 AbstractCegarLoop]: Abstraction has 3045 states and 4691 transitions. [2020-07-20 23:04:39,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:39,012 INFO L276 IsEmpty]: Start isEmpty. Operand 3045 states and 4691 transitions. [2020-07-20 23:04:39,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-20 23:04:39,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:39,023 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] [2020-07-20 23:04:39,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:39,237 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:39,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:39,238 INFO L82 PathProgramCache]: Analyzing trace with hash 974426496, now seen corresponding path program 1 times [2020-07-20 23:04:39,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:39,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275291185] [2020-07-20 23:04:39,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:39,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:04:39,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:39,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 1111 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:39,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:39,671 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 23:04:39,671 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:39,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275291185] [2020-07-20 23:04:39,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:39,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:39,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470486712] [2020-07-20 23:04:39,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:39,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:39,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:39,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:39,674 INFO L87 Difference]: Start difference. First operand 3045 states and 4691 transitions. Second operand 3 states. [2020-07-20 23:04:39,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:39,887 INFO L93 Difference]: Finished difference Result 9027 states and 13894 transitions. [2020-07-20 23:04:39,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:39,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 333 [2020-07-20 23:04:39,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:39,917 INFO L225 Difference]: With dead ends: 9027 [2020-07-20 23:04:39,918 INFO L226 Difference]: Without dead ends: 6012 [2020-07-20 23:04:39,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 331 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 23:04:39,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6012 states. [2020-07-20 23:04:40,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6012 to 3055. [2020-07-20 23:04:40,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3055 states. [2020-07-20 23:04:40,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3055 states to 3055 states and 4705 transitions. [2020-07-20 23:04:40,094 INFO L78 Accepts]: Start accepts. Automaton has 3055 states and 4705 transitions. Word has length 333 [2020-07-20 23:04:40,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:40,094 INFO L479 AbstractCegarLoop]: Abstraction has 3055 states and 4705 transitions. [2020-07-20 23:04:40,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:40,094 INFO L276 IsEmpty]: Start isEmpty. Operand 3055 states and 4705 transitions. [2020-07-20 23:04:40,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 23:04:40,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:40,103 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] [2020-07-20 23:04:40,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:40,317 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:40,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:40,317 INFO L82 PathProgramCache]: Analyzing trace with hash 230711468, now seen corresponding path program 1 times [2020-07-20 23:04:40,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:40,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920880650] [2020-07-20 23:04:40,318 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:40,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:04:40,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:40,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:04:40,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:40,724 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 23:04:40,724 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:40,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920880650] [2020-07-20 23:04:40,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:40,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:04:40,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215966282] [2020-07-20 23:04:40,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:04:40,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:40,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:04:40,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:04:40,729 INFO L87 Difference]: Start difference. First operand 3055 states and 4705 transitions. Second operand 4 states. [2020-07-20 23:04:40,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:40,991 INFO L93 Difference]: Finished difference Result 6803 states and 10483 transitions. [2020-07-20 23:04:40,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:04:40,992 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 334 [2020-07-20 23:04:40,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:41,010 INFO L225 Difference]: With dead ends: 6803 [2020-07-20 23:04:41,011 INFO L226 Difference]: Without dead ends: 3436 [2020-07-20 23:04:41,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 331 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 23:04:41,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3436 states. [2020-07-20 23:04:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3436 to 3434. [2020-07-20 23:04:41,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3434 states. [2020-07-20 23:04:41,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3434 states to 3434 states and 5268 transitions. [2020-07-20 23:04:41,175 INFO L78 Accepts]: Start accepts. Automaton has 3434 states and 5268 transitions. Word has length 334 [2020-07-20 23:04:41,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:41,176 INFO L479 AbstractCegarLoop]: Abstraction has 3434 states and 5268 transitions. [2020-07-20 23:04:41,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:04:41,176 INFO L276 IsEmpty]: Start isEmpty. Operand 3434 states and 5268 transitions. [2020-07-20 23:04:41,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 23:04:41,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:41,185 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] [2020-07-20 23:04:41,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:41,400 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:41,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:41,400 INFO L82 PathProgramCache]: Analyzing trace with hash -2004901443, now seen corresponding path program 1 times [2020-07-20 23:04:41,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:41,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681086591] [2020-07-20 23:04:41,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:41,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:04:41,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:41,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 1252 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:41,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:41,865 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 23:04:41,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:41,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681086591] [2020-07-20 23:04:41,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:41,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:41,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187024712] [2020-07-20 23:04:41,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:41,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:41,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:41,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:41,868 INFO L87 Difference]: Start difference. First operand 3434 states and 5268 transitions. Second operand 3 states. [2020-07-20 23:04:42,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:42,175 INFO L93 Difference]: Finished difference Result 9877 states and 15086 transitions. [2020-07-20 23:04:42,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:42,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 335 [2020-07-20 23:04:42,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:42,209 INFO L225 Difference]: With dead ends: 9877 [2020-07-20 23:04:42,209 INFO L226 Difference]: Without dead ends: 6728 [2020-07-20 23:04:42,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 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 23:04:42,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6728 states. [2020-07-20 23:04:42,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6728 to 6726. [2020-07-20 23:04:42,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6726 states. [2020-07-20 23:04:42,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6726 states to 6726 states and 10257 transitions. [2020-07-20 23:04:42,554 INFO L78 Accepts]: Start accepts. Automaton has 6726 states and 10257 transitions. Word has length 335 [2020-07-20 23:04:42,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:42,555 INFO L479 AbstractCegarLoop]: Abstraction has 6726 states and 10257 transitions. [2020-07-20 23:04:42,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:42,556 INFO L276 IsEmpty]: Start isEmpty. Operand 6726 states and 10257 transitions. [2020-07-20 23:04:42,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 23:04:42,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:42,577 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] [2020-07-20 23:04:42,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:42,791 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:42,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:42,791 INFO L82 PathProgramCache]: Analyzing trace with hash -898270248, now seen corresponding path program 1 times [2020-07-20 23:04:42,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:42,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892861368] [2020-07-20 23:04:42,792 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:43,153 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:04:43,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:43,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:04:43,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:43,239 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 23:04:43,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:43,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892861368] [2020-07-20 23:04:43,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:43,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:04:43,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396570451] [2020-07-20 23:04:43,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:04:43,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:43,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:04:43,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:04:43,243 INFO L87 Difference]: Start difference. First operand 6726 states and 10257 transitions. Second operand 4 states. [2020-07-20 23:04:43,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:43,654 INFO L93 Difference]: Finished difference Result 19008 states and 28779 transitions. [2020-07-20 23:04:43,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:04:43,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 335 [2020-07-20 23:04:43,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:43,688 INFO L225 Difference]: With dead ends: 19008 [2020-07-20 23:04:43,688 INFO L226 Difference]: Without dead ends: 12952 [2020-07-20 23:04:43,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 332 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 23:04:43,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12952 states. [2020-07-20 23:04:44,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12952 to 7151. [2020-07-20 23:04:44,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7151 states. [2020-07-20 23:04:44,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7151 states to 7151 states and 10965 transitions. [2020-07-20 23:04:44,176 INFO L78 Accepts]: Start accepts. Automaton has 7151 states and 10965 transitions. Word has length 335 [2020-07-20 23:04:44,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:44,176 INFO L479 AbstractCegarLoop]: Abstraction has 7151 states and 10965 transitions. [2020-07-20 23:04:44,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:04:44,176 INFO L276 IsEmpty]: Start isEmpty. Operand 7151 states and 10965 transitions. [2020-07-20 23:04:44,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 23:04:44,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:44,193 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] [2020-07-20 23:04:44,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:44,407 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:44,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:44,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1545200663, now seen corresponding path program 1 times [2020-07-20 23:04:44,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:44,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473304912] [2020-07-20 23:04:44,408 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:44,657 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:04:44,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:44,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 23:04:44,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:44,804 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 23:04:44,804 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:44,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473304912] [2020-07-20 23:04:44,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:44,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 23:04:44,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937152986] [2020-07-20 23:04:44,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 23:04:44,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:44,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 23:04:44,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 23:04:44,807 INFO L87 Difference]: Start difference. First operand 7151 states and 10965 transitions. Second operand 9 states. [2020-07-20 23:04:51,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:51,296 INFO L93 Difference]: Finished difference Result 36145 states and 55612 transitions. [2020-07-20 23:04:51,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 23:04:51,297 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 336 [2020-07-20 23:04:51,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:51,394 INFO L225 Difference]: With dead ends: 36145 [2020-07-20 23:04:51,394 INFO L226 Difference]: Without dead ends: 34885 [2020-07-20 23:04:51,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 23:04:51,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34885 states. [2020-07-20 23:04:52,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34885 to 16061. [2020-07-20 23:04:52,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16061 states. [2020-07-20 23:04:52,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16061 states to 16061 states and 24713 transitions. [2020-07-20 23:04:52,606 INFO L78 Accepts]: Start accepts. Automaton has 16061 states and 24713 transitions. Word has length 336 [2020-07-20 23:04:52,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:52,607 INFO L479 AbstractCegarLoop]: Abstraction has 16061 states and 24713 transitions. [2020-07-20 23:04:52,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 23:04:52,607 INFO L276 IsEmpty]: Start isEmpty. Operand 16061 states and 24713 transitions. [2020-07-20 23:04:52,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 23:04:52,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:52,633 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] [2020-07-20 23:04:52,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:52,847 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:52,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:52,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1029599991, now seen corresponding path program 1 times [2020-07-20 23:04:52,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:52,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [906451739] [2020-07-20 23:04:52,849 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:53,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:04:53,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:53,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:53,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:53,185 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 23:04:53,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:53,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [906451739] [2020-07-20 23:04:53,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:53,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:53,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669505052] [2020-07-20 23:04:53,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:53,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:53,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:53,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:53,189 INFO L87 Difference]: Start difference. First operand 16061 states and 24713 transitions. Second operand 3 states. [2020-07-20 23:04:54,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:54,040 INFO L93 Difference]: Finished difference Result 34825 states and 53827 transitions. [2020-07-20 23:04:54,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:54,041 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 23:04:54,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:54,090 INFO L225 Difference]: With dead ends: 34825 [2020-07-20 23:04:54,090 INFO L226 Difference]: Without dead ends: 21323 [2020-07-20 23:04:54,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 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 23:04:54,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21323 states. [2020-07-20 23:04:55,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21323 to 19073. [2020-07-20 23:04:55,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19073 states. [2020-07-20 23:04:55,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19073 states to 19073 states and 29639 transitions. [2020-07-20 23:04:55,087 INFO L78 Accepts]: Start accepts. Automaton has 19073 states and 29639 transitions. Word has length 336 [2020-07-20 23:04:55,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:55,088 INFO L479 AbstractCegarLoop]: Abstraction has 19073 states and 29639 transitions. [2020-07-20 23:04:55,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:55,088 INFO L276 IsEmpty]: Start isEmpty. Operand 19073 states and 29639 transitions. [2020-07-20 23:04:55,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 23:04:55,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:55,112 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] [2020-07-20 23:04:55,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:55,328 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:55,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:55,328 INFO L82 PathProgramCache]: Analyzing trace with hash 2005120837, now seen corresponding path program 1 times [2020-07-20 23:04:55,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:55,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533310472] [2020-07-20 23:04:55,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:55,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:04:55,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:55,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:55,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:55,649 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 23:04:55,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:55,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533310472] [2020-07-20 23:04:55,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:55,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:55,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803357292] [2020-07-20 23:04:55,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:55,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:55,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:55,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:55,652 INFO L87 Difference]: Start difference. First operand 19073 states and 29639 transitions. Second operand 3 states. [2020-07-20 23:04:57,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:57,417 INFO L93 Difference]: Finished difference Result 56860 states and 88328 transitions. [2020-07-20 23:04:57,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:04:57,418 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 23:04:57,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:57,497 INFO L225 Difference]: With dead ends: 56860 [2020-07-20 23:04:57,497 INFO L226 Difference]: Without dead ends: 37962 [2020-07-20 23:04:57,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 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 23:04:57,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37962 states. [2020-07-20 23:04:58,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37962 to 19157. [2020-07-20 23:04:58,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19157 states. [2020-07-20 23:04:58,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19157 states to 19157 states and 29750 transitions. [2020-07-20 23:04:58,700 INFO L78 Accepts]: Start accepts. Automaton has 19157 states and 29750 transitions. Word has length 336 [2020-07-20 23:04:58,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:04:58,701 INFO L479 AbstractCegarLoop]: Abstraction has 19157 states and 29750 transitions. [2020-07-20 23:04:58,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:04:58,701 INFO L276 IsEmpty]: Start isEmpty. Operand 19157 states and 29750 transitions. [2020-07-20 23:04:58,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 23:04:58,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:04:58,729 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] [2020-07-20 23:04:58,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:58,946 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:04:58,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:04:58,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1430794148, now seen corresponding path program 1 times [2020-07-20 23:04:58,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:04:58,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665213921] [2020-07-20 23:04:58,948 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:04:59,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:04:59,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:04:59,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:04:59,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:04:59,241 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 23:04:59,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:04:59,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665213921] [2020-07-20 23:04:59,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:04:59,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:04:59,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805275183] [2020-07-20 23:04:59,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:04:59,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:04:59,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:04:59,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:04:59,244 INFO L87 Difference]: Start difference. First operand 19157 states and 29750 transitions. Second operand 3 states. [2020-07-20 23:05:00,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:00,665 INFO L93 Difference]: Finished difference Result 55101 states and 85223 transitions. [2020-07-20 23:05:00,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:05:00,665 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 337 [2020-07-20 23:05:00,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:00,726 INFO L225 Difference]: With dead ends: 55101 [2020-07-20 23:05:00,726 INFO L226 Difference]: Without dead ends: 37140 [2020-07-20 23:05:00,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 335 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 23:05:00,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37140 states. [2020-07-20 23:05:01,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37140 to 19306. [2020-07-20 23:05:01,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19306 states. [2020-07-20 23:05:01,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19306 states to 19306 states and 29944 transitions. [2020-07-20 23:05:01,886 INFO L78 Accepts]: Start accepts. Automaton has 19306 states and 29944 transitions. Word has length 337 [2020-07-20 23:05:01,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:01,886 INFO L479 AbstractCegarLoop]: Abstraction has 19306 states and 29944 transitions. [2020-07-20 23:05:01,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:05:01,887 INFO L276 IsEmpty]: Start isEmpty. Operand 19306 states and 29944 transitions. [2020-07-20 23:05:01,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 23:05:01,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:01,907 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] [2020-07-20 23:05:02,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:02,122 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:02,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:02,123 INFO L82 PathProgramCache]: Analyzing trace with hash -2075943733, now seen corresponding path program 1 times [2020-07-20 23:05:02,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:02,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636459761] [2020-07-20 23:05:02,125 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:02,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:05:02,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:02,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:05:02,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:02,486 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 23:05:02,486 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:02,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636459761] [2020-07-20 23:05:02,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:02,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:05:02,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968936042] [2020-07-20 23:05:02,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:05:02,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:02,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:05:02,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:05:02,490 INFO L87 Difference]: Start difference. First operand 19306 states and 29944 transitions. Second operand 3 states. [2020-07-20 23:05:05,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:05,079 INFO L93 Difference]: Finished difference Result 57393 states and 89011 transitions. [2020-07-20 23:05:05,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:05:05,080 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 337 [2020-07-20 23:05:05,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:05,138 INFO L225 Difference]: With dead ends: 57393 [2020-07-20 23:05:05,138 INFO L226 Difference]: Without dead ends: 38371 [2020-07-20 23:05:05,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 335 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 23:05:05,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38371 states. [2020-07-20 23:05:06,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38371 to 19396. [2020-07-20 23:05:06,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19396 states. [2020-07-20 23:05:06,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19396 states to 19396 states and 30062 transitions. [2020-07-20 23:05:06,181 INFO L78 Accepts]: Start accepts. Automaton has 19396 states and 30062 transitions. Word has length 337 [2020-07-20 23:05:06,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:06,181 INFO L479 AbstractCegarLoop]: Abstraction has 19396 states and 30062 transitions. [2020-07-20 23:05:06,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:05:06,181 INFO L276 IsEmpty]: Start isEmpty. Operand 19396 states and 30062 transitions. [2020-07-20 23:05:06,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 23:05:06,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:06,193 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] [2020-07-20 23:05:06,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:06,399 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:06,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:06,400 INFO L82 PathProgramCache]: Analyzing trace with hash -817493434, now seen corresponding path program 1 times [2020-07-20 23:05:06,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:06,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213536533] [2020-07-20 23:05:06,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:06,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:05:06,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:06,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1115 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:05:06,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:06,744 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 23:05:06,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:06,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213536533] [2020-07-20 23:05:06,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:06,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:05:06,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281624307] [2020-07-20 23:05:06,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:05:06,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:06,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:05:06,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:05:06,746 INFO L87 Difference]: Start difference. First operand 19396 states and 30062 transitions. Second operand 3 states. [2020-07-20 23:05:08,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:08,292 INFO L93 Difference]: Finished difference Result 57282 states and 88701 transitions. [2020-07-20 23:05:08,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:05:08,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 338 [2020-07-20 23:05:08,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:08,348 INFO L225 Difference]: With dead ends: 57282 [2020-07-20 23:05:08,348 INFO L226 Difference]: Without dead ends: 38389 [2020-07-20 23:05:08,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 336 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 23:05:08,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38389 states. [2020-07-20 23:05:09,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38389 to 19396. [2020-07-20 23:05:09,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19396 states. [2020-07-20 23:05:09,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19396 states to 19396 states and 30056 transitions. [2020-07-20 23:05:09,611 INFO L78 Accepts]: Start accepts. Automaton has 19396 states and 30056 transitions. Word has length 338 [2020-07-20 23:05:09,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:09,612 INFO L479 AbstractCegarLoop]: Abstraction has 19396 states and 30056 transitions. [2020-07-20 23:05:09,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:05:09,612 INFO L276 IsEmpty]: Start isEmpty. Operand 19396 states and 30056 transitions. [2020-07-20 23:05:09,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 23:05:09,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:09,622 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] [2020-07-20 23:05:09,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:09,823 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:09,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:09,824 INFO L82 PathProgramCache]: Analyzing trace with hash 164603442, now seen corresponding path program 1 times [2020-07-20 23:05:09,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:09,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1200012861] [2020-07-20 23:05:09,825 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:10,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:05:10,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:10,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 23:05:10,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:10,150 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 23:05:10,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:10,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1200012861] [2020-07-20 23:05:10,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:10,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 23:05:10,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853781858] [2020-07-20 23:05:10,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 23:05:10,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:10,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 23:05:10,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 23:05:10,153 INFO L87 Difference]: Start difference. First operand 19396 states and 30056 transitions. Second operand 9 states. [2020-07-20 23:05:20,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:20,248 INFO L93 Difference]: Finished difference Result 98539 states and 155026 transitions. [2020-07-20 23:05:20,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 23:05:20,248 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 338 [2020-07-20 23:05:20,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:20,396 INFO L225 Difference]: With dead ends: 98539 [2020-07-20 23:05:20,396 INFO L226 Difference]: Without dead ends: 92370 [2020-07-20 23:05:20,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 23:05:20,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92370 states. [2020-07-20 23:05:22,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92370 to 40884. [2020-07-20 23:05:22,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40884 states. [2020-07-20 23:05:22,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40884 states to 40884 states and 64180 transitions. [2020-07-20 23:05:22,990 INFO L78 Accepts]: Start accepts. Automaton has 40884 states and 64180 transitions. Word has length 338 [2020-07-20 23:05:22,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:22,991 INFO L479 AbstractCegarLoop]: Abstraction has 40884 states and 64180 transitions. [2020-07-20 23:05:22,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 23:05:22,991 INFO L276 IsEmpty]: Start isEmpty. Operand 40884 states and 64180 transitions. [2020-07-20 23:05:23,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 23:05:23,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:23,012 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] [2020-07-20 23:05:23,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:23,225 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:23,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:23,226 INFO L82 PathProgramCache]: Analyzing trace with hash -79709031, now seen corresponding path program 1 times [2020-07-20 23:05:23,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:23,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201921381] [2020-07-20 23:05:23,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:23,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:05:23,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:23,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:05:23,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:23,590 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 23:05:23,590 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:23,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201921381] [2020-07-20 23:05:23,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:23,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:05:23,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945485584] [2020-07-20 23:05:23,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:05:23,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:23,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:05:23,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:05:23,592 INFO L87 Difference]: Start difference. First operand 40884 states and 64180 transitions. Second operand 3 states. [2020-07-20 23:05:27,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:27,186 INFO L93 Difference]: Finished difference Result 94347 states and 149445 transitions. [2020-07-20 23:05:27,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:05:27,186 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 338 [2020-07-20 23:05:27,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:27,266 INFO L225 Difference]: With dead ends: 94347 [2020-07-20 23:05:27,266 INFO L226 Difference]: Without dead ends: 56567 [2020-07-20 23:05:27,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 336 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 23:05:27,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56567 states. [2020-07-20 23:05:31,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56567 to 52989. [2020-07-20 23:05:31,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52989 states. [2020-07-20 23:05:31,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52989 states to 52989 states and 83951 transitions. [2020-07-20 23:05:31,943 INFO L78 Accepts]: Start accepts. Automaton has 52989 states and 83951 transitions. Word has length 338 [2020-07-20 23:05:31,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:31,944 INFO L479 AbstractCegarLoop]: Abstraction has 52989 states and 83951 transitions. [2020-07-20 23:05:31,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:05:31,944 INFO L276 IsEmpty]: Start isEmpty. Operand 52989 states and 83951 transitions. [2020-07-20 23:05:31,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 23:05:31,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:31,967 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] [2020-07-20 23:05:32,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:32,180 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:32,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:32,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1866428229, now seen corresponding path program 1 times [2020-07-20 23:05:32,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:32,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934138470] [2020-07-20 23:05:32,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:32,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:05:32,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:32,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 1256 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:05:32,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:32,602 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 23:05:32,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:32,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934138470] [2020-07-20 23:05:32,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:32,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:05:32,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548422481] [2020-07-20 23:05:32,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:05:32,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:32,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:05:32,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:05:32,604 INFO L87 Difference]: Start difference. First operand 52989 states and 83951 transitions. Second operand 3 states. [2020-07-20 23:05:38,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:05:38,500 INFO L93 Difference]: Finished difference Result 154064 states and 243871 transitions. [2020-07-20 23:05:38,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:05:38,501 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 338 [2020-07-20 23:05:38,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:05:38,646 INFO L225 Difference]: With dead ends: 154064 [2020-07-20 23:05:38,646 INFO L226 Difference]: Without dead ends: 102319 [2020-07-20 23:05:38,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 336 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 23:05:38,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102319 states. [2020-07-20 23:05:46,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102319 to 102317. [2020-07-20 23:05:46,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102317 states. [2020-07-20 23:05:46,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102317 states to 102317 states and 161097 transitions. [2020-07-20 23:05:46,710 INFO L78 Accepts]: Start accepts. Automaton has 102317 states and 161097 transitions. Word has length 338 [2020-07-20 23:05:46,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:46,711 INFO L479 AbstractCegarLoop]: Abstraction has 102317 states and 161097 transitions. [2020-07-20 23:05:46,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:05:46,711 INFO L276 IsEmpty]: Start isEmpty. Operand 102317 states and 161097 transitions. [2020-07-20 23:05:46,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 23:05:46,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:46,741 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] [2020-07-20 23:05:46,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:46,955 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:46,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:46,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1032751925, now seen corresponding path program 1 times [2020-07-20 23:05:46,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:46,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691864357] [2020-07-20 23:05:46,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:47,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:05:47,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:47,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:05:47,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:47,242 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 23:05:47,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:47,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691864357] [2020-07-20 23:05:47,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:47,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:05:47,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602398999] [2020-07-20 23:05:47,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:05:47,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:47,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:05:47,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:05:47,245 INFO L87 Difference]: Start difference. First operand 102317 states and 161097 transitions. Second operand 4 states. [2020-07-20 23:06:01,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:06:01,124 INFO L93 Difference]: Finished difference Result 298067 states and 469125 transitions. [2020-07-20 23:06:01,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:06:01,125 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 338 [2020-07-20 23:06:01,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:06:01,431 INFO L225 Difference]: With dead ends: 298067 [2020-07-20 23:06:01,431 INFO L226 Difference]: Without dead ends: 197972 [2020-07-20 23:06:01,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 335 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 23:06:01,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197972 states. [2020-07-20 23:06:08,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197972 to 102720. [2020-07-20 23:06:08,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102720 states. [2020-07-20 23:06:09,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102720 states to 102720 states and 161782 transitions. [2020-07-20 23:06:09,028 INFO L78 Accepts]: Start accepts. Automaton has 102720 states and 161782 transitions. Word has length 338 [2020-07-20 23:06:09,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:06:09,028 INFO L479 AbstractCegarLoop]: Abstraction has 102720 states and 161782 transitions. [2020-07-20 23:06:09,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:06:09,028 INFO L276 IsEmpty]: Start isEmpty. Operand 102720 states and 161782 transitions. [2020-07-20 23:06:09,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 23:06:09,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:06:09,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:06:09,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:06:09,264 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:06:09,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:06:09,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1519261052, now seen corresponding path program 1 times [2020-07-20 23:06:09,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:06:09,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47160745] [2020-07-20 23:06:09,265 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:06:09,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:06:09,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:06:09,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 1266 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:06:09,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:06:09,669 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 23:06:09,670 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:06:09,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47160745] [2020-07-20 23:06:09,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:06:09,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:06:09,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763809204] [2020-07-20 23:06:09,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:06:09,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:06:09,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:06:09,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:06:09,677 INFO L87 Difference]: Start difference. First operand 102720 states and 161782 transitions. Second operand 4 states. [2020-07-20 23:06:23,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:06:23,900 INFO L93 Difference]: Finished difference Result 303338 states and 477402 transitions. [2020-07-20 23:06:23,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:06:23,901 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 339 [2020-07-20 23:06:23,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:06:24,213 INFO L225 Difference]: With dead ends: 303338 [2020-07-20 23:06:24,213 INFO L226 Difference]: Without dead ends: 201132 [2020-07-20 23:06:24,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 336 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 23:06:24,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201132 states. [2020-07-20 23:06:41,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201132 to 201130. [2020-07-20 23:06:41,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201130 states. [2020-07-20 23:06:41,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201130 states to 201130 states and 314524 transitions. [2020-07-20 23:06:41,916 INFO L78 Accepts]: Start accepts. Automaton has 201130 states and 314524 transitions. Word has length 339 [2020-07-20 23:06:41,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:06:41,916 INFO L479 AbstractCegarLoop]: Abstraction has 201130 states and 314524 transitions. [2020-07-20 23:06:41,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:06:41,916 INFO L276 IsEmpty]: Start isEmpty. Operand 201130 states and 314524 transitions. [2020-07-20 23:06:41,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 23:06:41,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:06:41,977 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] [2020-07-20 23:06:42,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:06:42,178 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:06:42,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:06:42,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1791843003, now seen corresponding path program 1 times [2020-07-20 23:06:42,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:06:42,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749029426] [2020-07-20 23:06:42,180 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:06:42,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:06:42,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:06:42,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 965 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:06:42,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:06:42,478 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 23:06:42,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:06:42,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749029426] [2020-07-20 23:06:42,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:06:42,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:06:42,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840197868] [2020-07-20 23:06:42,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:06:42,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:06:42,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:06:42,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:06:42,481 INFO L87 Difference]: Start difference. First operand 201130 states and 314524 transitions. Second operand 3 states. [2020-07-20 23:07:12,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:07:12,101 INFO L93 Difference]: Finished difference Result 595585 states and 930660 transitions. [2020-07-20 23:07:12,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:07:12,102 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 23:07:12,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:07:12,755 INFO L225 Difference]: With dead ends: 595585 [2020-07-20 23:07:12,755 INFO L226 Difference]: Without dead ends: 398242 [2020-07-20 23:07:12,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 338 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 23:07:13,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398242 states. [2020-07-20 23:07:35,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398242 to 201801. [2020-07-20 23:07:35,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201801 states. [2020-07-20 23:07:35,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201801 states to 201801 states and 315337 transitions. [2020-07-20 23:07:35,450 INFO L78 Accepts]: Start accepts. Automaton has 201801 states and 315337 transitions. Word has length 340 [2020-07-20 23:07:35,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:07:35,450 INFO L479 AbstractCegarLoop]: Abstraction has 201801 states and 315337 transitions. [2020-07-20 23:07:35,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:07:35,450 INFO L276 IsEmpty]: Start isEmpty. Operand 201801 states and 315337 transitions. [2020-07-20 23:07:35,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-20 23:07:35,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:07:35,512 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] [2020-07-20 23:07:35,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:07:35,713 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:07:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:07:35,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1870899798, now seen corresponding path program 1 times [2020-07-20 23:07:35,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:07:35,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1396975170] [2020-07-20 23:07:35,715 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:07:35,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:07:35,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:07:35,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:07:35,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:07:35,999 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 23:07:35,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:07:35,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1396975170] [2020-07-20 23:07:35,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:07:36,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:07:36,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690074745] [2020-07-20 23:07:36,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:07:36,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:07:36,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:07:36,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:07:36,001 INFO L87 Difference]: Start difference. First operand 201801 states and 315337 transitions. Second operand 4 states. [2020-07-20 23:08:08,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:08:08,928 INFO L93 Difference]: Finished difference Result 597612 states and 933789 transitions. [2020-07-20 23:08:08,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:08:08,928 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 341 [2020-07-20 23:08:08,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:08:09,579 INFO L225 Difference]: With dead ends: 597612 [2020-07-20 23:08:09,580 INFO L226 Difference]: Without dead ends: 400336 [2020-07-20 23:08:09,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 338 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 23:08:10,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400336 states. [2020-07-20 23:08:32,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400336 to 204498. [2020-07-20 23:08:32,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204498 states. [2020-07-20 23:08:33,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204498 states to 204498 states and 319535 transitions. [2020-07-20 23:08:33,022 INFO L78 Accepts]: Start accepts. Automaton has 204498 states and 319535 transitions. Word has length 341 [2020-07-20 23:08:33,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:08:33,023 INFO L479 AbstractCegarLoop]: Abstraction has 204498 states and 319535 transitions. [2020-07-20 23:08:33,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:08:33,023 INFO L276 IsEmpty]: Start isEmpty. Operand 204498 states and 319535 transitions. [2020-07-20 23:08:33,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-20 23:08:33,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:08:33,089 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] [2020-07-20 23:08:33,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:08:33,290 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:08:33,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:08:33,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1159274468, now seen corresponding path program 1 times [2020-07-20 23:08:33,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:08:33,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218656059] [2020-07-20 23:08:33,292 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:08:33,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:08:33,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:08:33,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 1271 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:08:33,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:08:33,661 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 23:08:33,662 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:08:33,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218656059] [2020-07-20 23:08:33,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:08:33,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:08:33,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299094093] [2020-07-20 23:08:33,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:08:33,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:08:33,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:08:33,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:08:33,664 INFO L87 Difference]: Start difference. First operand 204498 states and 319535 transitions. Second operand 3 states. [2020-07-20 23:09:08,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:09:08,918 INFO L93 Difference]: Finished difference Result 595499 states and 929141 transitions. [2020-07-20 23:09:08,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:09:08,919 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 341 [2020-07-20 23:09:08,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:09:09,542 INFO L225 Difference]: With dead ends: 595499 [2020-07-20 23:09:09,542 INFO L226 Difference]: Without dead ends: 397291 [2020-07-20 23:09:09,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 339 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 23:09:10,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397291 states. [2020-07-20 23:09:48,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397291 to 397289. [2020-07-20 23:09:48,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397289 states. [2020-07-20 23:09:49,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397289 states to 397289 states and 615612 transitions. [2020-07-20 23:09:49,236 INFO L78 Accepts]: Start accepts. Automaton has 397289 states and 615612 transitions. Word has length 341 [2020-07-20 23:09:49,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:09:49,236 INFO L479 AbstractCegarLoop]: Abstraction has 397289 states and 615612 transitions. [2020-07-20 23:09:49,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:09:49,237 INFO L276 IsEmpty]: Start isEmpty. Operand 397289 states and 615612 transitions. [2020-07-20 23:09:49,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2020-07-20 23:09:49,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:09:49,360 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] [2020-07-20 23:09:49,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:09:49,560 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:09:49,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:09:49,561 INFO L82 PathProgramCache]: Analyzing trace with hash -838166842, now seen corresponding path program 1 times [2020-07-20 23:09:49,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:09:49,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606856870] [2020-07-20 23:09:49,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:09:49,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:09:49,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:09:49,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 1126 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:09:49,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:09:49,907 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 23:09:49,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:09:49,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606856870] [2020-07-20 23:09:49,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:09:49,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:09:49,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327225566] [2020-07-20 23:09:49,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:09:49,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:09:49,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:09:49,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:09:49,908 INFO L87 Difference]: Start difference. First operand 397289 states and 615612 transitions. Second operand 4 states. [2020-07-20 23:10:29,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:29,490 INFO L93 Difference]: Finished difference Result 784614 states and 1215866 transitions. [2020-07-20 23:10:29,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:10:29,491 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 342 [2020-07-20 23:10:29,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:30,058 INFO L225 Difference]: With dead ends: 784614 [2020-07-20 23:10:30,058 INFO L226 Difference]: Without dead ends: 393977 [2020-07-20 23:10:30,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 339 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 23:10:30,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393977 states. [2020-07-20 23:11:09,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393977 to 393787. [2020-07-20 23:11:09,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393787 states. [2020-07-20 23:11:09,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393787 states to 393787 states and 610395 transitions. [2020-07-20 23:11:09,795 INFO L78 Accepts]: Start accepts. Automaton has 393787 states and 610395 transitions. Word has length 342 [2020-07-20 23:11:09,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:09,795 INFO L479 AbstractCegarLoop]: Abstraction has 393787 states and 610395 transitions. [2020-07-20 23:11:09,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:11:09,795 INFO L276 IsEmpty]: Start isEmpty. Operand 393787 states and 610395 transitions. [2020-07-20 23:11:09,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-20 23:11:09,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:09,911 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] [2020-07-20 23:11:10,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:10,126 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:10,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:10,126 INFO L82 PathProgramCache]: Analyzing trace with hash 74060233, now seen corresponding path program 1 times [2020-07-20 23:11:10,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:10,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707777512] [2020-07-20 23:11:10,127 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:11:10,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:11:10,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:10,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 1126 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:11:10,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:10,459 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 23:11:10,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:10,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707777512] [2020-07-20 23:11:10,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:10,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:11:10,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633698819] [2020-07-20 23:11:10,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:11:10,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:10,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:11:10,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:11:10,461 INFO L87 Difference]: Start difference. First operand 393787 states and 610395 transitions. Second operand 4 states. [2020-07-20 23:11:51,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:51,494 INFO L93 Difference]: Finished difference Result 800343 states and 1238925 transitions. [2020-07-20 23:11:51,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:11:51,494 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 343 [2020-07-20 23:11:51,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:52,122 INFO L225 Difference]: With dead ends: 800343 [2020-07-20 23:11:52,122 INFO L226 Difference]: Without dead ends: 401030 [2020-07-20 23:11:52,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 340 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 23:11:52,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401030 states. [2020-07-20 23:12:33,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401030 to 400936. [2020-07-20 23:12:33,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400936 states. [2020-07-20 23:12:34,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400936 states to 400936 states and 616519 transitions. [2020-07-20 23:12:34,097 INFO L78 Accepts]: Start accepts. Automaton has 400936 states and 616519 transitions. Word has length 343 [2020-07-20 23:12:34,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:34,098 INFO L479 AbstractCegarLoop]: Abstraction has 400936 states and 616519 transitions. [2020-07-20 23:12:34,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:12:34,098 INFO L276 IsEmpty]: Start isEmpty. Operand 400936 states and 616519 transitions. [2020-07-20 23:12:34,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 23:12:34,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:34,244 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] [2020-07-20 23:12:34,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:34,445 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:34,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:34,447 INFO L82 PathProgramCache]: Analyzing trace with hash 872149763, now seen corresponding path program 1 times [2020-07-20 23:12:34,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:34,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120116086] [2020-07-20 23:12:34,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:34,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:12:34,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:34,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 1276 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:12:34,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:34,818 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 23:12:34,818 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:34,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120116086] [2020-07-20 23:12:34,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:34,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:12:34,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758508357] [2020-07-20 23:12:34,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:12:34,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:34,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:12:34,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:12:34,820 INFO L87 Difference]: Start difference. First operand 400936 states and 616519 transitions. Second operand 3 states. [2020-07-20 23:13:45,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:13:45,972 INFO L93 Difference]: Finished difference Result 1171637 states and 1800198 transitions. [2020-07-20 23:13:45,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:13:45,972 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 345 [2020-07-20 23:13:45,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:13:47,378 INFO L225 Difference]: With dead ends: 1171637 [2020-07-20 23:13:47,379 INFO L226 Difference]: Without dead ends: 781275 [2020-07-20 23:13:48,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 343 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 23:13:48,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781275 states. [2020-07-20 23:15:20,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781275 to 780199. [2020-07-20 23:15:20,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 780199 states. [2020-07-20 23:15:22,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780199 states to 780199 states and 1193808 transitions. [2020-07-20 23:15:22,724 INFO L78 Accepts]: Start accepts. Automaton has 780199 states and 1193808 transitions. Word has length 345 [2020-07-20 23:15:22,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:15:22,724 INFO L479 AbstractCegarLoop]: Abstraction has 780199 states and 1193808 transitions. [2020-07-20 23:15:22,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:15:22,724 INFO L276 IsEmpty]: Start isEmpty. Operand 780199 states and 1193808 transitions. [2020-07-20 23:15:22,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-20 23:15:22,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:15:22,978 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] [2020-07-20 23:15:23,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:23,192 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:15:23,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:15:23,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1886907765, now seen corresponding path program 1 times [2020-07-20 23:15:23,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:15:23,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653475142] [2020-07-20 23:15:23,194 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:23,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:15:23,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:15:23,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:15:23,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:15:23,487 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 23:15:23,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:15:23,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653475142] [2020-07-20 23:15:23,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:15:23,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:15:23,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878553050] [2020-07-20 23:15:23,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:15:23,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:15:23,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:15:23,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:15:23,489 INFO L87 Difference]: Start difference. First operand 780199 states and 1193808 transitions. Second operand 4 states.