/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 BIGGEST_EQUIVALENCE_CLASS --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_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:47:52,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:47:52,288 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:47:52,310 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:47:52,310 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:47:52,313 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:47:52,315 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:47:52,327 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:47:52,331 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:47:52,332 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:47:52,334 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:47:52,336 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:47:52,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:47:52,339 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:47:52,342 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:47:52,343 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:47:52,345 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:47:52,347 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:47:52,349 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:47:52,355 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:47:52,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:47:52,364 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:47:52,366 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:47:52,367 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:47:52,369 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 23:47:52,370 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 23:47:52,370 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 23:47:52,372 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 23:47:52,373 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 23:47:52,374 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 23:47:52,374 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 23:47:52,376 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 23:47:52,376 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 23:47:52,377 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 23:47:52,378 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 23:47:52,379 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 23:47:52,380 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 23:47:52,380 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 23:47:52,380 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:47:52,381 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:47:52,383 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:47:52,384 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:47:52,410 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:47:52,410 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:47:52,413 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:47:52,414 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:47:52,414 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:47:52,414 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:47:52,414 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:47:52,414 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:47:52,415 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:47:52,415 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:47:52,415 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:47:52,415 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:47:52,415 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:47:52,416 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:47:52,416 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:47:52,416 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:47:52,416 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:47:52,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:47:52,417 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:47:52,417 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:47:52,417 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:47:52,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:47:52,417 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:47:52,417 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:47:52,418 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:47:52,418 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:47:52,418 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:47:52,418 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:47:52,418 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:47:52,419 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:47:52,761 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:47:52,775 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:47:52,779 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:47:52,781 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:47:52,781 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:47:52,782 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 23:47:52,851 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de0dbae4a/8fdfd8287e4b4657be242a0233dbef4e/FLAG3174c8445 [2020-07-21 23:47:53,618 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:47:53,618 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 23:47:53,640 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de0dbae4a/8fdfd8287e4b4657be242a0233dbef4e/FLAG3174c8445 [2020-07-21 23:47:53,838 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de0dbae4a/8fdfd8287e4b4657be242a0233dbef4e [2020-07-21 23:47:53,847 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:47:53,850 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:47:53,851 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:47:53,851 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:47:53,855 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:47:53,856 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:47:53" (1/1) ... [2020-07-21 23:47:53,859 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@234a323e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:53, skipping insertion in model container [2020-07-21 23:47:53,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:47:53" (1/1) ... [2020-07-21 23:47:53,868 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:47:54,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:47:55,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:47:55,496 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:47:56,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:47:56,598 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:47:56,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56 WrapperNode [2020-07-21 23:47:56,605 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:47:56,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:47:56,607 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:47:56,607 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:47:56,628 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... [2020-07-21 23:47:56,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:47:56,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:47:56,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:47:56,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:47:56,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:47:56,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:47:56,946 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:47:56,946 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:47:56,946 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:47:56,947 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:47:56,947 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 23:47:56,947 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:47:56,948 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 23:47:56,948 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:47:56,948 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:47:56,949 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 23:47:56,949 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 23:47:56,949 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 23:47:56,950 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 23:47:56,951 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 23:47:56,952 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 23:47:56,952 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 23:47:56,952 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 23:47:56,952 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 23:47:56,953 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:47:56,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:47:56,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:48:01,130 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:48:01,131 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 23:48:01,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:48:01 BoogieIcfgContainer [2020-07-21 23:48:01,142 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:48:01,143 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:48:01,144 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:48:01,147 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:48:01,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:47:53" (1/3) ... [2020-07-21 23:48:01,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d4dcb48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:48:01, skipping insertion in model container [2020-07-21 23:48:01,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:47:56" (2/3) ... [2020-07-21 23:48:01,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d4dcb48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:48:01, skipping insertion in model container [2020-07-21 23:48:01,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:48:01" (3/3) ... [2020-07-21 23:48:01,151 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 23:48:01,164 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:48:01,174 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:48:01,190 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:48:01,222 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:48:01,222 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:48:01,222 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:48:01,223 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:48:01,223 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:48:01,223 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:48:01,223 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:48:01,223 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:48:01,268 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-07-21 23:48:01,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 23:48:01,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:01,315 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:01,316 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:01,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:01,323 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-07-21 23:48:01,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:01,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100248458] [2020-07-21 23:48:01,334 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 [2020-07-21 23:48:01,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:01,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:01,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 2039 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:02,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:02,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:02,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:02,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100248458] [2020-07-21 23:48:02,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:02,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:02,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602522271] [2020-07-21 23:48:02,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:02,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:02,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:02,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:02,484 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 4 states. [2020-07-21 23:48:02,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:02,906 INFO L93 Difference]: Finished difference Result 3914 states and 7060 transitions. [2020-07-21 23:48:02,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:48:02,908 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-07-21 23:48:02,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:02,945 INFO L225 Difference]: With dead ends: 3914 [2020-07-21 23:48:02,945 INFO L226 Difference]: Without dead ends: 2599 [2020-07-21 23:48:02,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:02,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2599 states. [2020-07-21 23:48:03,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2599 to 2597. [2020-07-21 23:48:03,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2597 states. [2020-07-21 23:48:03,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2597 states to 2597 states and 4267 transitions. [2020-07-21 23:48:03,187 INFO L78 Accepts]: Start accepts. Automaton has 2597 states and 4267 transitions. Word has length 467 [2020-07-21 23:48:03,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:03,191 INFO L479 AbstractCegarLoop]: Abstraction has 2597 states and 4267 transitions. [2020-07-21 23:48:03,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:03,192 INFO L276 IsEmpty]: Start isEmpty. Operand 2597 states and 4267 transitions. [2020-07-21 23:48:03,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 23:48:03,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:03,212 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:03,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:03,426 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:03,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:03,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1773568236, now seen corresponding path program 1 times [2020-07-21 23:48:03,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:03,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792474149] [2020-07-21 23:48:03,428 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 [2020-07-21 23:48:03,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:03,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:03,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 2042 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:03,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:04,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:04,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:04,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792474149] [2020-07-21 23:48:04,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:04,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:04,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194195277] [2020-07-21 23:48:04,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:04,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:04,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:04,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:04,234 INFO L87 Difference]: Start difference. First operand 2597 states and 4267 transitions. Second operand 3 states. [2020-07-21 23:48:04,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:04,576 INFO L93 Difference]: Finished difference Result 7490 states and 12265 transitions. [2020-07-21 23:48:04,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:04,578 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 469 [2020-07-21 23:48:04,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:04,614 INFO L225 Difference]: With dead ends: 7490 [2020-07-21 23:48:04,615 INFO L226 Difference]: Without dead ends: 5122 [2020-07-21 23:48:04,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:04,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5122 states. [2020-07-21 23:48:04,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5122 to 5120. [2020-07-21 23:48:04,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5120 states. [2020-07-21 23:48:04,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5120 states to 5120 states and 8384 transitions. [2020-07-21 23:48:04,888 INFO L78 Accepts]: Start accepts. Automaton has 5120 states and 8384 transitions. Word has length 469 [2020-07-21 23:48:04,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:04,894 INFO L479 AbstractCegarLoop]: Abstraction has 5120 states and 8384 transitions. [2020-07-21 23:48:04,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:04,895 INFO L276 IsEmpty]: Start isEmpty. Operand 5120 states and 8384 transitions. [2020-07-21 23:48:04,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-21 23:48:04,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:04,919 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:05,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:05,134 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:05,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:05,134 INFO L82 PathProgramCache]: Analyzing trace with hash 945656500, now seen corresponding path program 1 times [2020-07-21 23:48:05,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:05,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610685977] [2020-07-21 23:48:05,135 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 [2020-07-21 23:48:05,525 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:05,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:05,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 1684 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:05,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:05,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:05,682 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:05,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610685977] [2020-07-21 23:48:05,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:05,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:05,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330502843] [2020-07-21 23:48:05,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:05,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:05,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:05,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:05,685 INFO L87 Difference]: Start difference. First operand 5120 states and 8384 transitions. Second operand 3 states. [2020-07-21 23:48:06,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:06,027 INFO L93 Difference]: Finished difference Result 15104 states and 24689 transitions. [2020-07-21 23:48:06,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:06,028 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 470 [2020-07-21 23:48:06,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:06,078 INFO L225 Difference]: With dead ends: 15104 [2020-07-21 23:48:06,079 INFO L226 Difference]: Without dead ends: 10015 [2020-07-21 23:48:06,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:06,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10015 states. [2020-07-21 23:48:06,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10015 to 5146. [2020-07-21 23:48:06,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5146 states. [2020-07-21 23:48:06,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5146 states to 5146 states and 8422 transitions. [2020-07-21 23:48:06,526 INFO L78 Accepts]: Start accepts. Automaton has 5146 states and 8422 transitions. Word has length 470 [2020-07-21 23:48:06,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:06,526 INFO L479 AbstractCegarLoop]: Abstraction has 5146 states and 8422 transitions. [2020-07-21 23:48:06,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:06,527 INFO L276 IsEmpty]: Start isEmpty. Operand 5146 states and 8422 transitions. [2020-07-21 23:48:06,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2020-07-21 23:48:06,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:06,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:06,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:06,762 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:06,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:06,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1276972281, now seen corresponding path program 1 times [2020-07-21 23:48:06,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:06,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084194188] [2020-07-21 23:48:06,764 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 [2020-07-21 23:48:07,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:07,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:07,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 1682 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:07,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:07,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:07,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:07,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084194188] [2020-07-21 23:48:07,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:07,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:07,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561448924] [2020-07-21 23:48:07,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:07,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:07,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:07,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:07,456 INFO L87 Difference]: Start difference. First operand 5146 states and 8422 transitions. Second operand 4 states. [2020-07-21 23:48:07,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:07,907 INFO L93 Difference]: Finished difference Result 12288 states and 20302 transitions. [2020-07-21 23:48:07,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:07,907 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 471 [2020-07-21 23:48:07,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:07,941 INFO L225 Difference]: With dead ends: 12288 [2020-07-21 23:48:07,941 INFO L226 Difference]: Without dead ends: 6220 [2020-07-21 23:48:07,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:07,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6220 states. [2020-07-21 23:48:08,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6220 to 6218. [2020-07-21 23:48:08,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6218 states. [2020-07-21 23:48:08,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6218 states to 6218 states and 10239 transitions. [2020-07-21 23:48:08,356 INFO L78 Accepts]: Start accepts. Automaton has 6218 states and 10239 transitions. Word has length 471 [2020-07-21 23:48:08,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:08,357 INFO L479 AbstractCegarLoop]: Abstraction has 6218 states and 10239 transitions. [2020-07-21 23:48:08,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:08,359 INFO L276 IsEmpty]: Start isEmpty. Operand 6218 states and 10239 transitions. [2020-07-21 23:48:08,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-21 23:48:08,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:08,386 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:08,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:08,600 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:08,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:08,600 INFO L82 PathProgramCache]: Analyzing trace with hash -583483881, now seen corresponding path program 1 times [2020-07-21 23:48:08,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:08,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1408813125] [2020-07-21 23:48:08,601 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 [2020-07-21 23:48:09,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:09,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:09,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 2046 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:09,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:09,358 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:09,358 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:09,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1408813125] [2020-07-21 23:48:09,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:09,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:09,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751967983] [2020-07-21 23:48:09,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:09,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:09,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:09,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:09,362 INFO L87 Difference]: Start difference. First operand 6218 states and 10239 transitions. Second operand 3 states. [2020-07-21 23:48:10,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:10,409 INFO L93 Difference]: Finished difference Result 18175 states and 29892 transitions. [2020-07-21 23:48:10,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:10,410 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 473 [2020-07-21 23:48:10,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:10,446 INFO L225 Difference]: With dead ends: 18175 [2020-07-21 23:48:10,446 INFO L226 Difference]: Without dead ends: 12333 [2020-07-21 23:48:10,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:10,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12333 states. [2020-07-21 23:48:10,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12333 to 12331. [2020-07-21 23:48:10,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12331 states. [2020-07-21 23:48:11,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12331 states to 12331 states and 20233 transitions. [2020-07-21 23:48:11,004 INFO L78 Accepts]: Start accepts. Automaton has 12331 states and 20233 transitions. Word has length 473 [2020-07-21 23:48:11,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:11,005 INFO L479 AbstractCegarLoop]: Abstraction has 12331 states and 20233 transitions. [2020-07-21 23:48:11,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:11,006 INFO L276 IsEmpty]: Start isEmpty. Operand 12331 states and 20233 transitions. [2020-07-21 23:48:11,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-21 23:48:11,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:11,035 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:11,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:11,248 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:11,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:11,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1982710364, now seen corresponding path program 1 times [2020-07-21 23:48:11,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:11,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323533223] [2020-07-21 23:48:11,249 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:11,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:11,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:11,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 1686 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:11,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:11,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:11,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:11,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323533223] [2020-07-21 23:48:11,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:11,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:11,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605500338] [2020-07-21 23:48:11,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:11,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:11,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:11,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:11,906 INFO L87 Difference]: Start difference. First operand 12331 states and 20233 transitions. Second operand 3 states. [2020-07-21 23:48:12,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:12,532 INFO L93 Difference]: Finished difference Result 36712 states and 60224 transitions. [2020-07-21 23:48:12,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:12,532 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 473 [2020-07-21 23:48:12,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:12,603 INFO L225 Difference]: With dead ends: 36712 [2020-07-21 23:48:12,604 INFO L226 Difference]: Without dead ends: 24518 [2020-07-21 23:48:12,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:12,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24518 states. [2020-07-21 23:48:13,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24518 to 12424. [2020-07-21 23:48:13,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12424 states. [2020-07-21 23:48:13,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12424 states to 12424 states and 20374 transitions. [2020-07-21 23:48:13,511 INFO L78 Accepts]: Start accepts. Automaton has 12424 states and 20374 transitions. Word has length 473 [2020-07-21 23:48:13,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:13,512 INFO L479 AbstractCegarLoop]: Abstraction has 12424 states and 20374 transitions. [2020-07-21 23:48:13,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:13,512 INFO L276 IsEmpty]: Start isEmpty. Operand 12424 states and 20374 transitions. [2020-07-21 23:48:13,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-21 23:48:13,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:13,541 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:13,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:13,754 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:13,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:13,754 INFO L82 PathProgramCache]: Analyzing trace with hash 674537359, now seen corresponding path program 1 times [2020-07-21 23:48:13,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:13,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925306447] [2020-07-21 23:48:13,755 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 [2020-07-21 23:48:14,155 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:14,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:14,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 1682 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:14,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:14,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:14,307 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:14,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925306447] [2020-07-21 23:48:14,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:14,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:14,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439252679] [2020-07-21 23:48:14,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:14,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:14,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:14,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:14,310 INFO L87 Difference]: Start difference. First operand 12424 states and 20374 transitions. Second operand 3 states. [2020-07-21 23:48:15,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:15,381 INFO L93 Difference]: Finished difference Result 36328 states and 59528 transitions. [2020-07-21 23:48:15,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:15,382 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 474 [2020-07-21 23:48:15,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:15,440 INFO L225 Difference]: With dead ends: 36328 [2020-07-21 23:48:15,441 INFO L226 Difference]: Without dead ends: 24390 [2020-07-21 23:48:15,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:15,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24390 states. [2020-07-21 23:48:16,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24390 to 12576. [2020-07-21 23:48:16,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12576 states. [2020-07-21 23:48:16,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12576 states to 12576 states and 20598 transitions. [2020-07-21 23:48:16,225 INFO L78 Accepts]: Start accepts. Automaton has 12576 states and 20598 transitions. Word has length 474 [2020-07-21 23:48:16,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:16,226 INFO L479 AbstractCegarLoop]: Abstraction has 12576 states and 20598 transitions. [2020-07-21 23:48:16,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:16,226 INFO L276 IsEmpty]: Start isEmpty. Operand 12576 states and 20598 transitions. [2020-07-21 23:48:16,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-21 23:48:16,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:16,254 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:16,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:16,471 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:16,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:16,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1511823556, now seen corresponding path program 1 times [2020-07-21 23:48:16,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:16,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480007180] [2020-07-21 23:48:16,473 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 [2020-07-21 23:48:16,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:16,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:16,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 1684 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:16,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:17,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:17,032 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:17,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480007180] [2020-07-21 23:48:17,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:17,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:17,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533951049] [2020-07-21 23:48:17,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:17,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:17,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:17,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:17,034 INFO L87 Difference]: Start difference. First operand 12576 states and 20598 transitions. Second operand 3 states. [2020-07-21 23:48:17,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:17,733 INFO L93 Difference]: Finished difference Result 37339 states and 61136 transitions. [2020-07-21 23:48:17,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:17,734 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 474 [2020-07-21 23:48:17,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:17,792 INFO L225 Difference]: With dead ends: 37339 [2020-07-21 23:48:17,792 INFO L226 Difference]: Without dead ends: 24954 [2020-07-21 23:48:17,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:17,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24954 states. [2020-07-21 23:48:18,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24954 to 12708. [2020-07-21 23:48:18,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12708 states. [2020-07-21 23:48:18,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12708 states to 12708 states and 20769 transitions. [2020-07-21 23:48:18,519 INFO L78 Accepts]: Start accepts. Automaton has 12708 states and 20769 transitions. Word has length 474 [2020-07-21 23:48:18,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:18,520 INFO L479 AbstractCegarLoop]: Abstraction has 12708 states and 20769 transitions. [2020-07-21 23:48:18,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:18,521 INFO L276 IsEmpty]: Start isEmpty. Operand 12708 states and 20769 transitions. [2020-07-21 23:48:18,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-21 23:48:18,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:18,550 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:18,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:18,764 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:18,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:18,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1489289690, now seen corresponding path program 1 times [2020-07-21 23:48:18,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:18,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066491231] [2020-07-21 23:48:18,767 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 [2020-07-21 23:48:19,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:19,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:19,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 2045 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:19,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:19,713 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:19,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066491231] [2020-07-21 23:48:19,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:19,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:19,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321398573] [2020-07-21 23:48:19,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:19,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:19,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:19,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:19,716 INFO L87 Difference]: Start difference. First operand 12708 states and 20769 transitions. Second operand 3 states. [2020-07-21 23:48:20,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:20,691 INFO L93 Difference]: Finished difference Result 35786 states and 58360 transitions. [2020-07-21 23:48:20,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:20,691 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 475 [2020-07-21 23:48:20,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:20,735 INFO L225 Difference]: With dead ends: 35786 [2020-07-21 23:48:20,735 INFO L226 Difference]: Without dead ends: 24622 [2020-07-21 23:48:20,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:20,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24622 states. [2020-07-21 23:48:21,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24622 to 24620. [2020-07-21 23:48:21,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24620 states. [2020-07-21 23:48:21,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24620 states to 24620 states and 40078 transitions. [2020-07-21 23:48:21,905 INFO L78 Accepts]: Start accepts. Automaton has 24620 states and 40078 transitions. Word has length 475 [2020-07-21 23:48:21,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:21,905 INFO L479 AbstractCegarLoop]: Abstraction has 24620 states and 40078 transitions. [2020-07-21 23:48:21,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:21,906 INFO L276 IsEmpty]: Start isEmpty. Operand 24620 states and 40078 transitions. [2020-07-21 23:48:21,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-21 23:48:21,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:21,933 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:22,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:22,141 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:22,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:22,142 INFO L82 PathProgramCache]: Analyzing trace with hash -795440966, now seen corresponding path program 1 times [2020-07-21 23:48:22,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:22,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485592550] [2020-07-21 23:48:22,143 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 [2020-07-21 23:48:22,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:22,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:22,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 1683 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:22,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:22,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:22,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:22,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485592550] [2020-07-21 23:48:22,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:22,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:22,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773789635] [2020-07-21 23:48:22,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:22,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:22,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:22,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:22,647 INFO L87 Difference]: Start difference. First operand 24620 states and 40078 transitions. Second operand 3 states. [2020-07-21 23:48:24,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:24,094 INFO L93 Difference]: Finished difference Result 71588 states and 116578 transitions. [2020-07-21 23:48:24,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:24,095 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-21 23:48:24,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:24,162 INFO L225 Difference]: With dead ends: 71588 [2020-07-21 23:48:24,162 INFO L226 Difference]: Without dead ends: 48142 [2020-07-21 23:48:24,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:24,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48142 states. [2020-07-21 23:48:26,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48142 to 24988. [2020-07-21 23:48:26,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24988 states. [2020-07-21 23:48:26,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24988 states to 24988 states and 40618 transitions. [2020-07-21 23:48:26,546 INFO L78 Accepts]: Start accepts. Automaton has 24988 states and 40618 transitions. Word has length 477 [2020-07-21 23:48:26,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:26,547 INFO L479 AbstractCegarLoop]: Abstraction has 24988 states and 40618 transitions. [2020-07-21 23:48:26,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:26,547 INFO L276 IsEmpty]: Start isEmpty. Operand 24988 states and 40618 transitions. [2020-07-21 23:48:26,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-21 23:48:26,580 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:26,581 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:26,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:26,795 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:26,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:26,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1230604503, now seen corresponding path program 1 times [2020-07-21 23:48:26,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:26,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818849070] [2020-07-21 23:48:26,797 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 [2020-07-21 23:48:27,200 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:27,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:27,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 1682 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:27,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:27,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:27,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818849070] [2020-07-21 23:48:27,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:27,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:27,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064905148] [2020-07-21 23:48:27,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:27,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:27,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:27,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:27,433 INFO L87 Difference]: Start difference. First operand 24988 states and 40618 transitions. Second operand 4 states. [2020-07-21 23:48:29,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:29,191 INFO L93 Difference]: Finished difference Result 60174 states and 98446 transitions. [2020-07-21 23:48:29,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:29,192 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 477 [2020-07-21 23:48:29,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:29,239 INFO L225 Difference]: With dead ends: 60174 [2020-07-21 23:48:29,240 INFO L226 Difference]: Without dead ends: 31636 [2020-07-21 23:48:29,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31636 states. [2020-07-21 23:48:30,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31636 to 31634. [2020-07-21 23:48:30,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31634 states. [2020-07-21 23:48:30,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31634 states to 31634 states and 51612 transitions. [2020-07-21 23:48:30,451 INFO L78 Accepts]: Start accepts. Automaton has 31634 states and 51612 transitions. Word has length 477 [2020-07-21 23:48:30,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:30,452 INFO L479 AbstractCegarLoop]: Abstraction has 31634 states and 51612 transitions. [2020-07-21 23:48:30,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:30,452 INFO L276 IsEmpty]: Start isEmpty. Operand 31634 states and 51612 transitions. [2020-07-21 23:48:30,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-21 23:48:30,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:30,494 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:30,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:30,707 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:30,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:30,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1961362072, now seen corresponding path program 1 times [2020-07-21 23:48:30,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:30,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460364799] [2020-07-21 23:48:30,710 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 [2020-07-21 23:48:31,109 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:31,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:31,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 1683 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:31,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:31,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:31,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:31,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460364799] [2020-07-21 23:48:31,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:31,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:31,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102533707] [2020-07-21 23:48:31,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:31,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:31,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:31,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:31,272 INFO L87 Difference]: Start difference. First operand 31634 states and 51612 transitions. Second operand 3 states. [2020-07-21 23:48:33,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:33,237 INFO L93 Difference]: Finished difference Result 88340 states and 143859 transitions. [2020-07-21 23:48:33,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:33,238 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-21 23:48:33,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:33,322 INFO L225 Difference]: With dead ends: 88340 [2020-07-21 23:48:33,322 INFO L226 Difference]: Without dead ends: 56970 [2020-07-21 23:48:33,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:33,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56970 states. [2020-07-21 23:48:34,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56970 to 31129. [2020-07-21 23:48:34,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31129 states. [2020-07-21 23:48:34,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31129 states to 31129 states and 50789 transitions. [2020-07-21 23:48:34,985 INFO L78 Accepts]: Start accepts. Automaton has 31129 states and 50789 transitions. Word has length 477 [2020-07-21 23:48:34,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:34,985 INFO L479 AbstractCegarLoop]: Abstraction has 31129 states and 50789 transitions. [2020-07-21 23:48:34,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:34,985 INFO L276 IsEmpty]: Start isEmpty. Operand 31129 states and 50789 transitions. [2020-07-21 23:48:35,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:48:35,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:35,024 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:35,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:35,238 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:35,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:35,239 INFO L82 PathProgramCache]: Analyzing trace with hash 834501377, now seen corresponding path program 1 times [2020-07-21 23:48:35,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:35,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614629449] [2020-07-21 23:48:35,240 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:35,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:35,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:35,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 2061 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:35,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:36,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:36,014 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:36,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614629449] [2020-07-21 23:48:36,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:36,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:48:36,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922264658] [2020-07-21 23:48:36,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:48:36,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:36,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:48:36,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:36,017 INFO L87 Difference]: Start difference. First operand 31129 states and 50789 transitions. Second operand 5 states. [2020-07-21 23:48:39,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:39,446 INFO L93 Difference]: Finished difference Result 43555 states and 69808 transitions. [2020-07-21 23:48:39,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:48:39,447 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 479 [2020-07-21 23:48:39,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:39,484 INFO L225 Difference]: With dead ends: 43555 [2020-07-21 23:48:39,484 INFO L226 Difference]: Without dead ends: 31129 [2020-07-21 23:48:39,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:48:39,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31129 states. [2020-07-21 23:48:40,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31129 to 31129. [2020-07-21 23:48:40,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31129 states. [2020-07-21 23:48:40,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31129 states to 31129 states and 50495 transitions. [2020-07-21 23:48:40,768 INFO L78 Accepts]: Start accepts. Automaton has 31129 states and 50495 transitions. Word has length 479 [2020-07-21 23:48:40,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:40,768 INFO L479 AbstractCegarLoop]: Abstraction has 31129 states and 50495 transitions. [2020-07-21 23:48:40,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:48:40,769 INFO L276 IsEmpty]: Start isEmpty. Operand 31129 states and 50495 transitions. [2020-07-21 23:48:40,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:48:40,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:40,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:41,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:41,003 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:41,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:41,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1425980284, now seen corresponding path program 1 times [2020-07-21 23:48:41,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:41,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236814256] [2020-07-21 23:48:41,005 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 [2020-07-21 23:48:41,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:41,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:41,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 2062 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:41,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:41,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:41,955 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:41,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236814256] [2020-07-21 23:48:41,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:41,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:41,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497141066] [2020-07-21 23:48:41,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:41,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:41,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:41,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:41,959 INFO L87 Difference]: Start difference. First operand 31129 states and 50495 transitions. Second operand 4 states. [2020-07-21 23:48:44,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:44,978 INFO L93 Difference]: Finished difference Result 88172 states and 142991 transitions. [2020-07-21 23:48:44,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:44,980 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-21 23:48:44,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:45,044 INFO L225 Difference]: With dead ends: 88172 [2020-07-21 23:48:45,044 INFO L226 Difference]: Without dead ends: 59654 [2020-07-21 23:48:45,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:45,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59654 states. [2020-07-21 23:48:49,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59654 to 59652. [2020-07-21 23:48:49,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59652 states. [2020-07-21 23:48:49,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59652 states to 59652 states and 96356 transitions. [2020-07-21 23:48:49,346 INFO L78 Accepts]: Start accepts. Automaton has 59652 states and 96356 transitions. Word has length 479 [2020-07-21 23:48:49,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:49,346 INFO L479 AbstractCegarLoop]: Abstraction has 59652 states and 96356 transitions. [2020-07-21 23:48:49,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:49,347 INFO L276 IsEmpty]: Start isEmpty. Operand 59652 states and 96356 transitions. [2020-07-21 23:48:49,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:48:49,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:49,401 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:49,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:49,602 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:49,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:49,603 INFO L82 PathProgramCache]: Analyzing trace with hash -854781687, now seen corresponding path program 1 times [2020-07-21 23:48:49,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:49,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658900400] [2020-07-21 23:48:49,604 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 [2020-07-21 23:48:50,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:50,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:50,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 1683 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:48:50,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:50,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:50,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:50,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658900400] [2020-07-21 23:48:50,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:50,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:50,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639487317] [2020-07-21 23:48:50,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:50,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:50,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:50,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:50,130 INFO L87 Difference]: Start difference. First operand 59652 states and 96356 transitions. Second operand 4 states. [2020-07-21 23:48:55,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:55,470 INFO L93 Difference]: Finished difference Result 170677 states and 274842 transitions. [2020-07-21 23:48:55,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:55,471 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-21 23:48:55,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:55,606 INFO L225 Difference]: With dead ends: 170677 [2020-07-21 23:48:55,606 INFO L226 Difference]: Without dead ends: 118723 [2020-07-21 23:48:55,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:55,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118723 states. [2020-07-21 23:49:01,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118723 to 68641. [2020-07-21 23:49:01,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68641 states. [2020-07-21 23:49:01,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68641 states to 68641 states and 111852 transitions. [2020-07-21 23:49:01,368 INFO L78 Accepts]: Start accepts. Automaton has 68641 states and 111852 transitions. Word has length 479 [2020-07-21 23:49:01,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:01,368 INFO L479 AbstractCegarLoop]: Abstraction has 68641 states and 111852 transitions. [2020-07-21 23:49:01,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:01,369 INFO L276 IsEmpty]: Start isEmpty. Operand 68641 states and 111852 transitions. [2020-07-21 23:49:01,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:49:01,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:01,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:01,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:01,631 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:01,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:01,632 INFO L82 PathProgramCache]: Analyzing trace with hash -568136698, now seen corresponding path program 1 times [2020-07-21 23:49:01,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:01,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265308724] [2020-07-21 23:49:01,633 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 [2020-07-21 23:49:02,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:02,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:02,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 2052 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:02,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:02,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:02,297 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:02,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265308724] [2020-07-21 23:49:02,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:02,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:02,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125876923] [2020-07-21 23:49:02,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:02,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:02,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:02,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:02,301 INFO L87 Difference]: Start difference. First operand 68641 states and 111852 transitions. Second operand 3 states. [2020-07-21 23:49:08,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:08,480 INFO L93 Difference]: Finished difference Result 191930 states and 312079 transitions. [2020-07-21 23:49:08,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:08,481 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-21 23:49:08,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:08,624 INFO L225 Difference]: With dead ends: 191930 [2020-07-21 23:49:08,624 INFO L226 Difference]: Without dead ends: 132188 [2020-07-21 23:49:08,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:08,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132188 states. [2020-07-21 23:49:17,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132188 to 132186. [2020-07-21 23:49:17,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132186 states. [2020-07-21 23:49:17,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132186 states to 132186 states and 214435 transitions. [2020-07-21 23:49:17,636 INFO L78 Accepts]: Start accepts. Automaton has 132186 states and 214435 transitions. Word has length 479 [2020-07-21 23:49:17,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:17,637 INFO L479 AbstractCegarLoop]: Abstraction has 132186 states and 214435 transitions. [2020-07-21 23:49:17,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:17,637 INFO L276 IsEmpty]: Start isEmpty. Operand 132186 states and 214435 transitions. [2020-07-21 23:49:17,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:49:17,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:17,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:17,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:17,963 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:17,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:17,964 INFO L82 PathProgramCache]: Analyzing trace with hash 2038867081, now seen corresponding path program 1 times [2020-07-21 23:49:17,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:17,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948913241] [2020-07-21 23:49:17,964 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 [2020-07-21 23:49:18,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:18,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:18,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 1683 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:49:18,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:18,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:18,475 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:18,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948913241] [2020-07-21 23:49:18,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:18,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:18,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138578306] [2020-07-21 23:49:18,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:18,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:18,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:18,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:18,478 INFO L87 Difference]: Start difference. First operand 132186 states and 214435 transitions. Second operand 4 states. [2020-07-21 23:49:31,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:31,888 INFO L93 Difference]: Finished difference Result 348890 states and 561834 transitions. [2020-07-21 23:49:31,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:31,889 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-21 23:49:31,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:32,187 INFO L225 Difference]: With dead ends: 348890 [2020-07-21 23:49:32,187 INFO L226 Difference]: Without dead ends: 242744 [2020-07-21 23:49:32,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:49:32,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242744 states. [2020-07-21 23:49:45,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242744 to 149468. [2020-07-21 23:49:45,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149468 states. [2020-07-21 23:49:46,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149468 states to 149468 states and 243616 transitions. [2020-07-21 23:49:46,100 INFO L78 Accepts]: Start accepts. Automaton has 149468 states and 243616 transitions. Word has length 479 [2020-07-21 23:49:46,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:46,101 INFO L479 AbstractCegarLoop]: Abstraction has 149468 states and 243616 transitions. [2020-07-21 23:49:46,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:46,101 INFO L276 IsEmpty]: Start isEmpty. Operand 149468 states and 243616 transitions. [2020-07-21 23:49:46,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-21 23:49:46,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:46,247 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:46,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:46,448 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:46,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:46,449 INFO L82 PathProgramCache]: Analyzing trace with hash 271964941, now seen corresponding path program 1 times [2020-07-21 23:49:46,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:46,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628427227] [2020-07-21 23:49:46,450 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 [2020-07-21 23:49:46,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:46,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:46,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 1684 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:46,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:47,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:47,005 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:47,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628427227] [2020-07-21 23:49:47,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:47,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:47,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169356471] [2020-07-21 23:49:47,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:47,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:47,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:47,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:47,008 INFO L87 Difference]: Start difference. First operand 149468 states and 243616 transitions. Second operand 4 states. [2020-07-21 23:50:02,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:02,116 INFO L93 Difference]: Finished difference Result 368247 states and 601159 transitions. [2020-07-21 23:50:02,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:02,117 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 481 [2020-07-21 23:50:02,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:02,382 INFO L225 Difference]: With dead ends: 368247 [2020-07-21 23:50:02,382 INFO L226 Difference]: Without dead ends: 195249 [2020-07-21 23:50:02,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:50:02,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195249 states. [2020-07-21 23:50:14,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195249 to 195247. [2020-07-21 23:50:14,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195247 states. [2020-07-21 23:50:14,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195247 states to 195247 states and 317211 transitions. [2020-07-21 23:50:14,809 INFO L78 Accepts]: Start accepts. Automaton has 195247 states and 317211 transitions. Word has length 481 [2020-07-21 23:50:14,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:14,809 INFO L479 AbstractCegarLoop]: Abstraction has 195247 states and 317211 transitions. [2020-07-21 23:50:14,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:50:14,809 INFO L276 IsEmpty]: Start isEmpty. Operand 195247 states and 317211 transitions. [2020-07-21 23:50:15,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-21 23:50:15,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:15,002 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:15,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:15,203 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:15,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:15,204 INFO L82 PathProgramCache]: Analyzing trace with hash 827931104, now seen corresponding path program 1 times [2020-07-21 23:50:15,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:15,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434138463] [2020-07-21 23:50:15,205 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 [2020-07-21 23:50:15,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:15,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:15,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 2065 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:15,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:15,851 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:50:15,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:15,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434138463] [2020-07-21 23:50:15,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:15,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:15,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002235125] [2020-07-21 23:50:15,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:15,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:15,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:15,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:15,853 INFO L87 Difference]: Start difference. First operand 195247 states and 317211 transitions. Second operand 3 states. [2020-07-21 23:50:37,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:37,976 INFO L93 Difference]: Finished difference Result 512962 states and 828102 transitions. [2020-07-21 23:50:37,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:37,976 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-21 23:50:37,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:38,854 INFO L225 Difference]: With dead ends: 512962 [2020-07-21 23:50:38,855 INFO L226 Difference]: Without dead ends: 359040 [2020-07-21 23:50:38,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:39,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359040 states. [2020-07-21 23:51:09,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359040 to 359038. [2020-07-21 23:51:09,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359038 states. [2020-07-21 23:51:09,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359038 states to 359038 states and 578685 transitions. [2020-07-21 23:51:09,999 INFO L78 Accepts]: Start accepts. Automaton has 359038 states and 578685 transitions. Word has length 481 [2020-07-21 23:51:10,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:51:10,000 INFO L479 AbstractCegarLoop]: Abstraction has 359038 states and 578685 transitions. [2020-07-21 23:51:10,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:51:10,000 INFO L276 IsEmpty]: Start isEmpty. Operand 359038 states and 578685 transitions. [2020-07-21 23:51:10,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 23:51:10,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:51:10,374 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:51:10,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:51:10,575 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:51:10,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:51:10,576 INFO L82 PathProgramCache]: Analyzing trace with hash 1675558975, now seen corresponding path program 1 times [2020-07-21 23:51:10,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:51:10,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267721684] [2020-07-21 23:51:10,577 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 [2020-07-21 23:51:10,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:51:10,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:51:10,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:51:10,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:51:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:51:11,080 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:51:11,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267721684] [2020-07-21 23:51:11,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:51:11,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:51:11,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801132587] [2020-07-21 23:51:11,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:51:11,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:51:11,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:51:11,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:51:11,082 INFO L87 Difference]: Start difference. First operand 359038 states and 578685 transitions. Second operand 3 states. [2020-07-21 23:51:52,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:51:52,919 INFO L93 Difference]: Finished difference Result 959916 states and 1540707 transitions. [2020-07-21 23:51:52,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:51:52,920 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 484 [2020-07-21 23:51:52,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:51:53,722 INFO L225 Difference]: With dead ends: 959916 [2020-07-21 23:51:53,722 INFO L226 Difference]: Without dead ends: 607335 [2020-07-21 23:51:54,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:51:54,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607335 states. [2020-07-21 23:52:25,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607335 to 344097. [2020-07-21 23:52:25,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 344097 states. [2020-07-21 23:52:26,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344097 states to 344097 states and 553594 transitions. [2020-07-21 23:52:26,454 INFO L78 Accepts]: Start accepts. Automaton has 344097 states and 553594 transitions. Word has length 484 [2020-07-21 23:52:26,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:52:26,454 INFO L479 AbstractCegarLoop]: Abstraction has 344097 states and 553594 transitions. [2020-07-21 23:52:26,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:52:26,455 INFO L276 IsEmpty]: Start isEmpty. Operand 344097 states and 553594 transitions. [2020-07-21 23:52:26,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 23:52:26,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:52:26,844 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:52:27,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:52:27,045 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:52:27,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:52:27,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1740988036, now seen corresponding path program 1 times [2020-07-21 23:52:27,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:52:27,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745397010] [2020-07-21 23:52:27,047 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 [2020-07-21 23:52:27,431 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:52:27,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:52:27,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:52:27,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:52:27,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:52:27,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:52:27,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745397010] [2020-07-21 23:52:27,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:52:27,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:52:27,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328984697] [2020-07-21 23:52:27,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:52:27,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:52:27,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:52:27,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:52:27,533 INFO L87 Difference]: Start difference. First operand 344097 states and 553594 transitions. Second operand 3 states. [2020-07-21 23:53:13,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:53:13,835 INFO L93 Difference]: Finished difference Result 995469 states and 1596840 transitions. [2020-07-21 23:53:13,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:53:13,835 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 23:53:13,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:53:14,889 INFO L225 Difference]: With dead ends: 995469 [2020-07-21 23:53:14,889 INFO L226 Difference]: Without dead ends: 667398 [2020-07-21 23:53:15,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:53:15,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667398 states. [2020-07-21 23:53:50,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667398 to 349565. [2020-07-21 23:53:50,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349565 states. [2020-07-21 23:53:51,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349565 states to 349565 states and 560960 transitions. [2020-07-21 23:53:51,304 INFO L78 Accepts]: Start accepts. Automaton has 349565 states and 560960 transitions. Word has length 485 [2020-07-21 23:53:51,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:53:51,304 INFO L479 AbstractCegarLoop]: Abstraction has 349565 states and 560960 transitions. [2020-07-21 23:53:51,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:53:51,305 INFO L276 IsEmpty]: Start isEmpty. Operand 349565 states and 560960 transitions. [2020-07-21 23:53:51,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 23:53:51,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:53:51,725 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:53:51,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:53:51,926 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:53:51,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:53:51,927 INFO L82 PathProgramCache]: Analyzing trace with hash -2125731354, now seen corresponding path program 1 times [2020-07-21 23:53:51,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:53:51,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563387160] [2020-07-21 23:53:51,928 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 [2020-07-21 23:53:52,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:53:52,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:53:52,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 1687 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:53:52,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:53:52,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:53:52,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:53:52,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563387160] [2020-07-21 23:53:52,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:53:52,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:53:52,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590891576] [2020-07-21 23:53:52,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:53:52,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:53:52,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:53:52,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:53:52,444 INFO L87 Difference]: Start difference. First operand 349565 states and 560960 transitions. Second operand 3 states. [2020-07-21 23:54:40,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:54:40,305 INFO L93 Difference]: Finished difference Result 959865 states and 1534787 transitions. [2020-07-21 23:54:40,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:54:40,305 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 23:54:40,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:54:41,266 INFO L225 Difference]: With dead ends: 959865 [2020-07-21 23:54:41,266 INFO L226 Difference]: Without dead ends: 655069 [2020-07-21 23:54:41,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:54:42,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655069 states. [2020-07-21 23:55:19,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655069 to 359223. [2020-07-21 23:55:19,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359223 states. [2020-07-21 23:55:20,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359223 states to 359223 states and 573817 transitions. [2020-07-21 23:55:20,320 INFO L78 Accepts]: Start accepts. Automaton has 359223 states and 573817 transitions. Word has length 485 [2020-07-21 23:55:20,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:55:20,320 INFO L479 AbstractCegarLoop]: Abstraction has 359223 states and 573817 transitions. [2020-07-21 23:55:20,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:55:20,321 INFO L276 IsEmpty]: Start isEmpty. Operand 359223 states and 573817 transitions. [2020-07-21 23:55:20,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 23:55:20,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:55:20,714 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:55:20,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:55:20,923 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:55:20,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:55:20,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1133850919, now seen corresponding path program 1 times [2020-07-21 23:55:20,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:55:20,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749001878] [2020-07-21 23:55:20,925 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 [2020-07-21 23:55:21,316 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:55:21,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:55:21,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 1691 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:55:21,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:55:21,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:55:21,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:55:21,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749001878] [2020-07-21 23:55:21,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:55:21,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:55:21,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190053605] [2020-07-21 23:55:21,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:55:21,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:55:21,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:55:21,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:55:21,412 INFO L87 Difference]: Start difference. First operand 359223 states and 573817 transitions. Second operand 3 states. [2020-07-21 23:56:10,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:56:10,202 INFO L93 Difference]: Finished difference Result 910147 states and 1450362 transitions. [2020-07-21 23:56:10,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:56:10,202 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 23:56:10,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:56:11,137 INFO L225 Difference]: With dead ends: 910147 [2020-07-21 23:56:11,138 INFO L226 Difference]: Without dead ends: 636022 [2020-07-21 23:56:11,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:56:11,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636022 states. [2020-07-21 23:56:51,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636022 to 377428. [2020-07-21 23:56:51,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377428 states. [2020-07-21 23:56:52,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377428 states to 377428 states and 600217 transitions. [2020-07-21 23:56:52,241 INFO L78 Accepts]: Start accepts. Automaton has 377428 states and 600217 transitions. Word has length 485 [2020-07-21 23:56:52,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:56:52,242 INFO L479 AbstractCegarLoop]: Abstraction has 377428 states and 600217 transitions. [2020-07-21 23:56:52,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:56:52,242 INFO L276 IsEmpty]: Start isEmpty. Operand 377428 states and 600217 transitions. [2020-07-21 23:56:52,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-21 23:56:52,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:56:52,708 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:56:52,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:56:52,920 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:56:52,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:56:52,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1652130691, now seen corresponding path program 1 times [2020-07-21 23:56:52,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:56:52,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399942304] [2020-07-21 23:56:52,922 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 [2020-07-21 23:56:53,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:56:53,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:56:53,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 1690 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:56:53,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:56:53,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:56:53,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:56:53,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399942304] [2020-07-21 23:56:53,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:56:53,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:56:53,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135384696] [2020-07-21 23:56:53,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:56:53,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:56:53,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:56:53,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:56:53,411 INFO L87 Difference]: Start difference. First operand 377428 states and 600217 transitions. Second operand 3 states. [2020-07-21 23:57:46,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:46,013 INFO L93 Difference]: Finished difference Result 922353 states and 1461690 transitions. [2020-07-21 23:57:46,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:46,014 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 486 [2020-07-21 23:57:46,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:46,976 INFO L225 Difference]: With dead ends: 922353 [2020-07-21 23:57:46,976 INFO L226 Difference]: Without dead ends: 646419 [2020-07-21 23:57:47,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:48,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646419 states. [2020-07-21 23:58:31,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646419 to 399121. [2020-07-21 23:58:31,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399121 states. [2020-07-21 23:58:31,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399121 states to 399121 states and 626974 transitions. [2020-07-21 23:58:31,952 INFO L78 Accepts]: Start accepts. Automaton has 399121 states and 626974 transitions. Word has length 486 [2020-07-21 23:58:31,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:58:31,953 INFO L479 AbstractCegarLoop]: Abstraction has 399121 states and 626974 transitions. [2020-07-21 23:58:31,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:58:31,953 INFO L276 IsEmpty]: Start isEmpty. Operand 399121 states and 626974 transitions. [2020-07-21 23:58:33,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 23:58:33,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:58:33,396 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:58:33,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:33,607 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:58:33,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:58:33,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1981094920, now seen corresponding path program 1 times [2020-07-21 23:58:33,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:58:33,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745290086] [2020-07-21 23:58:33,609 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 [2020-07-21 23:58:34,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:58:34,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:34,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 1688 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:58:34,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:34,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:58:34,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:34,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745290086] [2020-07-21 23:58:34,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:34,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:58:34,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382418747] [2020-07-21 23:58:34,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:58:34,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:34,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:58:34,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:58:34,112 INFO L87 Difference]: Start difference. First operand 399121 states and 626974 transitions. Second operand 4 states.