/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:59:33,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:59:33,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:59:33,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:59:33,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:59:33,329 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:59:33,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:59:33,332 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:59:33,334 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:59:33,334 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:59:33,335 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:59:33,336 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:59:33,337 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:59:33,338 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:59:33,339 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:59:33,340 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:59:33,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:59:33,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:59:33,343 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:59:33,345 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:59:33,347 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:59:33,348 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:59:33,349 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:59:33,350 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:59:33,352 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 22:59:33,352 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 22:59:33,353 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 22:59:33,353 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 22:59:33,354 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 22:59:33,355 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 22:59:33,355 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 22:59:33,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 22:59:33,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 22:59:33,357 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 22:59:33,358 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 22:59:33,358 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 22:59:33,359 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 22:59:33,359 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 22:59:33,359 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:59:33,360 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:59:33,361 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:59:33,362 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 22:59:33,376 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:59:33,376 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:59:33,377 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:59:33,378 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:59:33,378 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:59:33,378 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:59:33,378 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:59:33,378 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:59:33,379 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:59:33,379 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:59:33,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:59:33,379 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:59:33,379 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:59:33,380 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:59:33,380 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:59:33,380 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:59:33,380 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:59:33,380 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:59:33,381 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:59:33,381 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:59:33,381 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:59:33,381 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:59:33,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:59:33,382 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:59:33,382 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:59:33,382 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:59:33,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:33,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:59:33,383 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:59:33,383 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:59:33,670 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:59:33,683 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:59:33,686 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:59:33,688 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:59:33,688 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:59:33,689 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 22:59:33,747 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a6fc6c6b/c41c84b79caf4df9be3d68866870b52a/FLAG853500d12 [2020-07-20 22:59:34,466 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:59:34,467 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 22:59:34,492 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a6fc6c6b/c41c84b79caf4df9be3d68866870b52a/FLAG853500d12 [2020-07-20 22:59:34,562 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a6fc6c6b/c41c84b79caf4df9be3d68866870b52a [2020-07-20 22:59:34,570 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:59:34,572 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:59:34,573 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:59:34,573 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:59:34,577 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:59:34,578 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:59:34" (1/1) ... [2020-07-20 22:59:34,580 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fa6377f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:34, skipping insertion in model container [2020-07-20 22:59:34,581 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:59:34" (1/1) ... [2020-07-20 22:59:34,588 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:59:34,767 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:59:36,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:59:36,243 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:59:37,734 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:59:37,761 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:59:37,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37 WrapperNode [2020-07-20 22:59:37,761 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:59:37,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:59:37,762 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:59:37,762 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:59:37,776 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,810 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,811 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:37,989 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... [2020-07-20 22:59:38,005 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:59:38,006 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:59:38,006 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:59:38,006 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:59:38,007 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:59:38,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:59:38,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:59:38,080 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:59:38,080 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:59:38,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:59:38,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 22:59:38,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 22:59:38,081 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 22:59:38,082 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:59:38,082 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:59:38,082 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 22:59:38,082 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 22:59:38,082 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 22:59:38,083 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 22:59:38,083 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 22:59:38,083 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 22:59:38,083 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 22:59:38,084 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 22:59:38,084 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 22:59:38,084 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:59:38,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:59:38,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:59:41,921 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:59:41,922 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 22:59:41,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:59:41 BoogieIcfgContainer [2020-07-20 22:59:41,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:59:41,934 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:59:41,934 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:59:41,937 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:59:41,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:59:34" (1/3) ... [2020-07-20 22:59:41,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@82f4c73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:59:41, skipping insertion in model container [2020-07-20 22:59:41,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:37" (2/3) ... [2020-07-20 22:59:41,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@82f4c73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:59:41, skipping insertion in model container [2020-07-20 22:59:41,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:59:41" (3/3) ... [2020-07-20 22:59:41,941 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 22:59:41,953 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:59:41,962 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 22:59:41,975 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 22:59:42,003 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:59:42,003 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:59:42,003 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:59:42,004 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:59:42,004 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:59:42,004 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:59:42,004 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:59:42,004 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:59:42,045 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states. [2020-07-20 22:59:42,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-20 22:59:42,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:42,087 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] [2020-07-20 22:59:42,088 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:42,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:42,095 INFO L82 PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times [2020-07-20 22:59:42,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:42,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472114611] [2020-07-20 22:59:42,105 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:42,830 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:42,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:42,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 1635 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:59:42,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:43,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:43,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:43,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472114611] [2020-07-20 22:59:43,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:43,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 22:59:43,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882406871] [2020-07-20 22:59:43,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 22:59:43,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:43,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 22:59:43,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 22:59:43,422 INFO L87 Difference]: Start difference. First operand 1371 states. Second operand 4 states. [2020-07-20 22:59:43,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:43,834 INFO L93 Difference]: Finished difference Result 4059 states and 7350 transitions. [2020-07-20 22:59:43,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:59:43,836 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 464 [2020-07-20 22:59:43,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:43,869 INFO L225 Difference]: With dead ends: 4059 [2020-07-20 22:59:43,869 INFO L226 Difference]: Without dead ends: 2697 [2020-07-20 22:59:43,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:59:43,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2020-07-20 22:59:44,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647. [2020-07-20 22:59:44,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-07-20 22:59:44,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions. [2020-07-20 22:59:44,052 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464 [2020-07-20 22:59:44,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:44,053 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions. [2020-07-20 22:59:44,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 22:59:44,054 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions. [2020-07-20 22:59:44,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-07-20 22:59:44,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:44,066 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] [2020-07-20 22:59:44,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:44,280 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:44,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:44,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times [2020-07-20 22:59:44,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:44,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167883235] [2020-07-20 22:59:44,283 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:44,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:44,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:44,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:44,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:45,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:45,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:45,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167883235] [2020-07-20 22:59:45,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:45,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:45,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472813043] [2020-07-20 22:59:45,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:45,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:45,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:45,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:45,042 INFO L87 Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 3 states. [2020-07-20 22:59:45,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:45,382 INFO L93 Difference]: Finished difference Result 7670 states and 12560 transitions. [2020-07-20 22:59:45,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:45,383 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 466 [2020-07-20 22:59:45,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:45,419 INFO L225 Difference]: With dead ends: 7670 [2020-07-20 22:59:45,420 INFO L226 Difference]: Without dead ends: 5237 [2020-07-20 22:59:45,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:45,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5237 states. [2020-07-20 22:59:45,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189. [2020-07-20 22:59:45,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5189 states. [2020-07-20 22:59:45,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions. [2020-07-20 22:59:45,654 INFO L78 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466 [2020-07-20 22:59:45,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:45,659 INFO L479 AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions. [2020-07-20 22:59:45,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:45,660 INFO L276 IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions. [2020-07-20 22:59:45,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 22:59:45,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:45,682 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] [2020-07-20 22:59:45,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:45,897 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:45,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:45,898 INFO L82 PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times [2020-07-20 22:59:45,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:45,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625186598] [2020-07-20 22:59:45,899 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:46,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:46,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:46,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:46,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:46,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:46,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:46,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625186598] [2020-07-20 22:59:46,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:46,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:46,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621773566] [2020-07-20 22:59:46,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:46,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:46,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:46,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:46,532 INFO L87 Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 3 states. [2020-07-20 22:59:46,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:46,863 INFO L93 Difference]: Finished difference Result 15470 states and 25323 transitions. [2020-07-20 22:59:46,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:46,864 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 467 [2020-07-20 22:59:46,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:46,919 INFO L225 Difference]: With dead ends: 15470 [2020-07-20 22:59:46,919 INFO L226 Difference]: Without dead ends: 10333 [2020-07-20 22:59:46,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 465 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:46,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10333 states. [2020-07-20 22:59:47,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10333 to 5236. [2020-07-20 22:59:47,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5236 states. [2020-07-20 22:59:47,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5236 states to 5236 states and 8571 transitions. [2020-07-20 22:59:47,251 INFO L78 Accepts]: Start accepts. Automaton has 5236 states and 8571 transitions. Word has length 467 [2020-07-20 22:59:47,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:47,251 INFO L479 AbstractCegarLoop]: Abstraction has 5236 states and 8571 transitions. [2020-07-20 22:59:47,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:47,252 INFO L276 IsEmpty]: Start isEmpty. Operand 5236 states and 8571 transitions. [2020-07-20 22:59:47,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 22:59:47,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:47,276 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] [2020-07-20 22:59:47,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:47,491 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:47,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:47,491 INFO L82 PathProgramCache]: Analyzing trace with hash 536524677, now seen corresponding path program 1 times [2020-07-20 22:59:47,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:47,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668095961] [2020-07-20 22:59:47,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:48,010 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:48,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:48,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:48,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:48,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:48,242 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:48,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668095961] [2020-07-20 22:59:48,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:48,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:48,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737141899] [2020-07-20 22:59:48,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:48,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:48,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:48,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:48,245 INFO L87 Difference]: Start difference. First operand 5236 states and 8571 transitions. Second operand 3 states. [2020-07-20 22:59:49,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:49,049 INFO L93 Difference]: Finished difference Result 15048 states and 24542 transitions. [2020-07-20 22:59:49,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:49,050 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 468 [2020-07-20 22:59:49,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:49,130 INFO L225 Difference]: With dead ends: 15048 [2020-07-20 22:59:49,130 INFO L226 Difference]: Without dead ends: 10211 [2020-07-20 22:59:49,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:49,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10211 states. [2020-07-20 22:59:49,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10211 to 10165. [2020-07-20 22:59:49,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10165 states. [2020-07-20 22:59:49,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10165 states to 10165 states and 16557 transitions. [2020-07-20 22:59:49,623 INFO L78 Accepts]: Start accepts. Automaton has 10165 states and 16557 transitions. Word has length 468 [2020-07-20 22:59:49,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:49,624 INFO L479 AbstractCegarLoop]: Abstraction has 10165 states and 16557 transitions. [2020-07-20 22:59:49,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:49,626 INFO L276 IsEmpty]: Start isEmpty. Operand 10165 states and 16557 transitions. [2020-07-20 22:59:49,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 22:59:49,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:49,658 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] [2020-07-20 22:59:49,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:49,873 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:49,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:49,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1157993354, now seen corresponding path program 1 times [2020-07-20 22:59:49,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:49,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557239695] [2020-07-20 22:59:49,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:50,205 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:59:50,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:50,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 1425 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:50,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:50,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:50,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:50,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557239695] [2020-07-20 22:59:50,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:50,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:50,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754941292] [2020-07-20 22:59:50,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:50,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:50,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:50,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:50,353 INFO L87 Difference]: Start difference. First operand 10165 states and 16557 transitions. Second operand 3 states. [2020-07-20 22:59:50,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:50,909 INFO L93 Difference]: Finished difference Result 30225 states and 49195 transitions. [2020-07-20 22:59:50,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:50,910 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 468 [2020-07-20 22:59:50,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:50,955 INFO L225 Difference]: With dead ends: 30225 [2020-07-20 22:59:50,955 INFO L226 Difference]: Without dead ends: 20199 [2020-07-20 22:59:50,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:51,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20199 states. [2020-07-20 22:59:51,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20199 to 10244. [2020-07-20 22:59:51,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10244 states. [2020-07-20 22:59:51,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10244 states to 10244 states and 16662 transitions. [2020-07-20 22:59:51,387 INFO L78 Accepts]: Start accepts. Automaton has 10244 states and 16662 transitions. Word has length 468 [2020-07-20 22:59:51,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:51,387 INFO L479 AbstractCegarLoop]: Abstraction has 10244 states and 16662 transitions. [2020-07-20 22:59:51,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:51,387 INFO L276 IsEmpty]: Start isEmpty. Operand 10244 states and 16662 transitions. [2020-07-20 22:59:51,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 22:59:51,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:51,414 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] [2020-07-20 22:59:51,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:51,628 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:51,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:51,629 INFO L82 PathProgramCache]: Analyzing trace with hash -903588472, now seen corresponding path program 1 times [2020-07-20 22:59:51,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:51,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544767988] [2020-07-20 22:59:51,630 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:52,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:52,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:52,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:52,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:52,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:52,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:52,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544767988] [2020-07-20 22:59:52,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:52,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:52,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597240720] [2020-07-20 22:59:52,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:52,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:52,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:52,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:52,238 INFO L87 Difference]: Start difference. First operand 10244 states and 16662 transitions. Second operand 3 states. [2020-07-20 22:59:52,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:52,972 INFO L93 Difference]: Finished difference Result 30385 states and 49416 transitions. [2020-07-20 22:59:52,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:52,972 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 469 [2020-07-20 22:59:52,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:53,019 INFO L225 Difference]: With dead ends: 30385 [2020-07-20 22:59:53,019 INFO L226 Difference]: Without dead ends: 20335 [2020-07-20 22:59:53,044 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 [2020-07-20 22:59:53,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20335 states. [2020-07-20 22:59:53,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20335 to 10380. [2020-07-20 22:59:53,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10380 states. [2020-07-20 22:59:53,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10380 states to 10380 states and 16854 transitions. [2020-07-20 22:59:53,542 INFO L78 Accepts]: Start accepts. Automaton has 10380 states and 16854 transitions. Word has length 469 [2020-07-20 22:59:53,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:53,543 INFO L479 AbstractCegarLoop]: Abstraction has 10380 states and 16854 transitions. [2020-07-20 22:59:53,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:53,543 INFO L276 IsEmpty]: Start isEmpty. Operand 10380 states and 16854 transitions. [2020-07-20 22:59:53,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 22:59:53,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:53,647 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] [2020-07-20 22:59:53,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:53,862 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:53,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:53,862 INFO L82 PathProgramCache]: Analyzing trace with hash 2073063424, now seen corresponding path program 1 times [2020-07-20 22:59:53,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:53,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388367733] [2020-07-20 22:59:53,863 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:54,256 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:54,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:54,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:59:54,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:54,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:54,391 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:54,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388367733] [2020-07-20 22:59:54,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:54,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 22:59:54,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709965820] [2020-07-20 22:59:54,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 22:59:54,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:54,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 22:59:54,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 22:59:54,394 INFO L87 Difference]: Start difference. First operand 10380 states and 16854 transitions. Second operand 4 states. [2020-07-20 22:59:54,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:54,903 INFO L93 Difference]: Finished difference Result 24544 states and 40169 transitions. [2020-07-20 22:59:54,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 22:59:54,904 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 470 [2020-07-20 22:59:54,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:54,932 INFO L225 Difference]: With dead ends: 24544 [2020-07-20 22:59:54,933 INFO L226 Difference]: Without dead ends: 12759 [2020-07-20 22:59:54,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:59:54,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12759 states. [2020-07-20 22:59:55,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12759 to 12710. [2020-07-20 22:59:55,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12710 states. [2020-07-20 22:59:55,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12710 states to 12710 states and 20736 transitions. [2020-07-20 22:59:55,546 INFO L78 Accepts]: Start accepts. Automaton has 12710 states and 20736 transitions. Word has length 470 [2020-07-20 22:59:55,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:55,547 INFO L479 AbstractCegarLoop]: Abstraction has 12710 states and 20736 transitions. [2020-07-20 22:59:55,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 22:59:55,547 INFO L276 IsEmpty]: Start isEmpty. Operand 12710 states and 20736 transitions. [2020-07-20 22:59:55,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2020-07-20 22:59:55,585 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:55,586 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] [2020-07-20 22:59:55,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:55,799 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:55,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:55,799 INFO L82 PathProgramCache]: Analyzing trace with hash -353723420, now seen corresponding path program 1 times [2020-07-20 22:59:55,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:55,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368668636] [2020-07-20 22:59:55,800 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:56,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:59:56,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:56,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:56,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:56,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:56,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:56,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368668636] [2020-07-20 22:59:56,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:56,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:56,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659349540] [2020-07-20 22:59:56,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:56,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:56,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:56,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:56,411 INFO L87 Difference]: Start difference. First operand 12710 states and 20736 transitions. Second operand 3 states. [2020-07-20 22:59:57,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:59:57,185 INFO L93 Difference]: Finished difference Result 36834 states and 60141 transitions. [2020-07-20 22:59:57,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:59:57,186 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 472 [2020-07-20 22:59:57,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:59:57,217 INFO L225 Difference]: With dead ends: 36834 [2020-07-20 22:59:57,217 INFO L226 Difference]: Without dead ends: 24879 [2020-07-20 22:59:57,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 470 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:57,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24879 states. [2020-07-20 22:59:57,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24879 to 24843. [2020-07-20 22:59:57,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24843 states. [2020-07-20 22:59:57,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24843 states to 24843 states and 40400 transitions. [2020-07-20 22:59:57,999 INFO L78 Accepts]: Start accepts. Automaton has 24843 states and 40400 transitions. Word has length 472 [2020-07-20 22:59:57,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:59:57,999 INFO L479 AbstractCegarLoop]: Abstraction has 24843 states and 40400 transitions. [2020-07-20 22:59:57,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:59:57,999 INFO L276 IsEmpty]: Start isEmpty. Operand 24843 states and 40400 transitions. [2020-07-20 22:59:58,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 22:59:58,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:59:58,657 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:59:58,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:58,867 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:59:58,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:59:58,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1105313875, now seen corresponding path program 1 times [2020-07-20 22:59:58,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:59:58,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474389427] [2020-07-20 22:59:58,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:59:59,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:59:59,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:59:59,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 1428 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 22:59:59,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:59:59,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:59:59,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:59:59,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474389427] [2020-07-20 22:59:59,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:59:59,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:59:59,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154782708] [2020-07-20 22:59:59,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:59:59,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:59:59,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:59:59,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:59:59,328 INFO L87 Difference]: Start difference. First operand 24843 states and 40400 transitions. Second operand 3 states. [2020-07-20 23:00:00,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:00,431 INFO L93 Difference]: Finished difference Result 70941 states and 115158 transitions. [2020-07-20 23:00:00,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:00:00,432 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 473 [2020-07-20 23:00:00,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:00,481 INFO L225 Difference]: With dead ends: 70941 [2020-07-20 23:00:00,482 INFO L226 Difference]: Without dead ends: 47904 [2020-07-20 23:00:00,513 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 [2020-07-20 23:00:00,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47904 states. [2020-07-20 23:00:01,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47904 to 25095. [2020-07-20 23:00:01,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25095 states. [2020-07-20 23:00:01,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25095 states to 25095 states and 40764 transitions. [2020-07-20 23:00:01,349 INFO L78 Accepts]: Start accepts. Automaton has 25095 states and 40764 transitions. Word has length 473 [2020-07-20 23:00:01,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:01,350 INFO L479 AbstractCegarLoop]: Abstraction has 25095 states and 40764 transitions. [2020-07-20 23:00:01,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:00:01,350 INFO L276 IsEmpty]: Start isEmpty. Operand 25095 states and 40764 transitions. [2020-07-20 23:00:01,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-20 23:00:01,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:01,372 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] [2020-07-20 23:00:01,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:01,573 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:01,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:01,574 INFO L82 PathProgramCache]: Analyzing trace with hash -319233921, now seen corresponding path program 1 times [2020-07-20 23:00:01,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:01,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038850526] [2020-07-20 23:00:01,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:02,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:00:02,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:02,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 1643 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:00:02,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:02,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:02,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:02,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038850526] [2020-07-20 23:00:02,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:02,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:00:02,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745525197] [2020-07-20 23:00:02,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:00:02,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:02,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:00:02,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:00:02,302 INFO L87 Difference]: Start difference. First operand 25095 states and 40764 transitions. Second operand 4 states. [2020-07-20 23:00:04,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:04,093 INFO L93 Difference]: Finished difference Result 72970 states and 118608 transitions. [2020-07-20 23:00:04,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:00:04,095 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 474 [2020-07-20 23:00:04,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:04,143 INFO L225 Difference]: With dead ends: 72970 [2020-07-20 23:00:04,143 INFO L226 Difference]: Without dead ends: 48895 [2020-07-20 23:00:04,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:00:04,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48895 states. [2020-07-20 23:00:06,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48895 to 48856. [2020-07-20 23:00:06,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48856 states. [2020-07-20 23:00:06,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48856 states to 48856 states and 78986 transitions. [2020-07-20 23:00:06,973 INFO L78 Accepts]: Start accepts. Automaton has 48856 states and 78986 transitions. Word has length 474 [2020-07-20 23:00:06,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:06,974 INFO L479 AbstractCegarLoop]: Abstraction has 48856 states and 78986 transitions. [2020-07-20 23:00:06,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:00:06,974 INFO L276 IsEmpty]: Start isEmpty. Operand 48856 states and 78986 transitions. [2020-07-20 23:00:07,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 23:00:07,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:07,033 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:00:07,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:07,248 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:07,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:07,248 INFO L82 PathProgramCache]: Analyzing trace with hash 197417427, now seen corresponding path program 1 times [2020-07-20 23:00:07,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:07,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641312635] [2020-07-20 23:00:07,249 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:07,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:00:07,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:07,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 1642 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:00:07,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:07,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:07,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:07,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641312635] [2020-07-20 23:00:07,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:07,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:00:07,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319056502] [2020-07-20 23:00:07,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:00:07,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:07,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:00:07,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:07,829 INFO L87 Difference]: Start difference. First operand 48856 states and 78986 transitions. Second operand 3 states. [2020-07-20 23:00:10,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:10,869 INFO L93 Difference]: Finished difference Result 139858 states and 225892 transitions. [2020-07-20 23:00:10,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:00:10,869 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 476 [2020-07-20 23:00:10,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:10,964 INFO L225 Difference]: With dead ends: 139858 [2020-07-20 23:00:10,964 INFO L226 Difference]: Without dead ends: 95465 [2020-07-20 23:00:10,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:11,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95465 states. [2020-07-20 23:00:15,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95465 to 95420. [2020-07-20 23:00:15,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95420 states. [2020-07-20 23:00:15,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95420 states to 95420 states and 153670 transitions. [2020-07-20 23:00:15,805 INFO L78 Accepts]: Start accepts. Automaton has 95420 states and 153670 transitions. Word has length 476 [2020-07-20 23:00:15,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:15,806 INFO L479 AbstractCegarLoop]: Abstraction has 95420 states and 153670 transitions. [2020-07-20 23:00:15,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:00:15,806 INFO L276 IsEmpty]: Start isEmpty. Operand 95420 states and 153670 transitions. [2020-07-20 23:00:15,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-20 23:00:15,901 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:15,902 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:00:16,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:16,103 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:16,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:16,104 INFO L82 PathProgramCache]: Analyzing trace with hash 920467146, now seen corresponding path program 1 times [2020-07-20 23:00:16,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:16,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670840748] [2020-07-20 23:00:16,105 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:16,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:00:16,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:16,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 1430 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:00:16,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:16,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:16,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:16,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670840748] [2020-07-20 23:00:16,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:16,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:00:16,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364080729] [2020-07-20 23:00:16,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:00:16,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:16,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:00:16,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:16,562 INFO L87 Difference]: Start difference. First operand 95420 states and 153670 transitions. Second operand 3 states. [2020-07-20 23:00:24,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:24,593 INFO L93 Difference]: Finished difference Result 282802 states and 455306 transitions. [2020-07-20 23:00:24,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:00:24,594 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-20 23:00:24,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:24,835 INFO L225 Difference]: With dead ends: 282802 [2020-07-20 23:00:24,836 INFO L226 Difference]: Without dead ends: 189061 [2020-07-20 23:00:24,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:25,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189061 states. [2020-07-20 23:00:28,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189061 to 96180. [2020-07-20 23:00:28,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96180 states. [2020-07-20 23:00:28,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96180 states to 96180 states and 154780 transitions. [2020-07-20 23:00:28,684 INFO L78 Accepts]: Start accepts. Automaton has 96180 states and 154780 transitions. Word has length 477 [2020-07-20 23:00:28,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:28,685 INFO L479 AbstractCegarLoop]: Abstraction has 96180 states and 154780 transitions. [2020-07-20 23:00:28,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:00:28,685 INFO L276 IsEmpty]: Start isEmpty. Operand 96180 states and 154780 transitions. [2020-07-20 23:00:28,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 23:00:28,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:28,760 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:00:28,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:28,961 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:28,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:28,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1721099883, now seen corresponding path program 1 times [2020-07-20 23:00:28,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:28,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923976066] [2020-07-20 23:00:28,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:29,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:00:29,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:29,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 1646 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:00:29,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:29,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:29,486 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:29,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923976066] [2020-07-20 23:00:29,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:29,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:00:29,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841395022] [2020-07-20 23:00:29,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:00:29,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:29,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:00:29,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:29,488 INFO L87 Difference]: Start difference. First operand 96180 states and 154780 transitions. Second operand 3 states. [2020-07-20 23:00:37,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:37,814 INFO L93 Difference]: Finished difference Result 281716 states and 453110 transitions. [2020-07-20 23:00:37,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:00:37,814 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 23:00:37,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:38,012 INFO L225 Difference]: With dead ends: 281716 [2020-07-20 23:00:38,012 INFO L226 Difference]: Without dead ends: 187415 [2020-07-20 23:00:38,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:38,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187415 states. [2020-07-20 23:00:42,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187415 to 97010. [2020-07-20 23:00:42,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97010 states. [2020-07-20 23:00:42,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97010 states to 97010 states and 155910 transitions. [2020-07-20 23:00:42,612 INFO L78 Accepts]: Start accepts. Automaton has 97010 states and 155910 transitions. Word has length 478 [2020-07-20 23:00:42,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:42,613 INFO L479 AbstractCegarLoop]: Abstraction has 97010 states and 155910 transitions. [2020-07-20 23:00:42,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:00:42,613 INFO L276 IsEmpty]: Start isEmpty. Operand 97010 states and 155910 transitions. [2020-07-20 23:00:42,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 23:00:42,685 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:42,686 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:00:42,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:42,892 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:42,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:42,893 INFO L82 PathProgramCache]: Analyzing trace with hash 915548140, now seen corresponding path program 1 times [2020-07-20 23:00:42,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:42,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582359267] [2020-07-20 23:00:42,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:43,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:00:43,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:43,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:00:43,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:43,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:43,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582359267] [2020-07-20 23:00:43,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:43,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:00:43,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988538438] [2020-07-20 23:00:43,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:00:43,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:43,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:00:43,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:43,432 INFO L87 Difference]: Start difference. First operand 97010 states and 155910 transitions. Second operand 3 states. [2020-07-20 23:00:52,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:00:52,030 INFO L93 Difference]: Finished difference Result 285892 states and 459636 transitions. [2020-07-20 23:00:52,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:00:52,031 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-20 23:00:52,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:00:52,218 INFO L225 Difference]: With dead ends: 285892 [2020-07-20 23:00:52,218 INFO L226 Difference]: Without dead ends: 191371 [2020-07-20 23:00:52,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:00:52,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191371 states. [2020-07-20 23:00:57,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191371 to 98490. [2020-07-20 23:00:57,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98490 states. [2020-07-20 23:00:57,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98490 states to 98490 states and 157910 transitions. [2020-07-20 23:00:57,230 INFO L78 Accepts]: Start accepts. Automaton has 98490 states and 157910 transitions. Word has length 479 [2020-07-20 23:00:57,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:00:57,231 INFO L479 AbstractCegarLoop]: Abstraction has 98490 states and 157910 transitions. [2020-07-20 23:00:57,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:00:57,231 INFO L276 IsEmpty]: Start isEmpty. Operand 98490 states and 157910 transitions. [2020-07-20 23:00:57,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 481 [2020-07-20 23:00:57,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:00:57,306 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] [2020-07-20 23:00:57,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:57,507 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:00:57,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:00:57,508 INFO L82 PathProgramCache]: Analyzing trace with hash 1951020265, now seen corresponding path program 1 times [2020-07-20 23:00:57,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:00:57,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202059731] [2020-07-20 23:00:57,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:00:57,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:00:57,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:00:57,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:00:57,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:00:58,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:00:58,088 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:00:58,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202059731] [2020-07-20 23:00:58,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:00:58,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:00:58,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345110897] [2020-07-20 23:00:58,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:00:58,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:00:58,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:00:58,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:00:58,091 INFO L87 Difference]: Start difference. First operand 98490 states and 157910 transitions. Second operand 4 states. [2020-07-20 23:01:09,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:01:09,003 INFO L93 Difference]: Finished difference Result 285902 states and 459062 transitions. [2020-07-20 23:01:09,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:01:09,004 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 480 [2020-07-20 23:01:09,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:01:09,194 INFO L225 Difference]: With dead ends: 285902 [2020-07-20 23:01:09,195 INFO L226 Difference]: Without dead ends: 191121 [2020-07-20 23:01:09,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:01:09,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191121 states. [2020-07-20 23:01:20,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191121 to 190703. [2020-07-20 23:01:20,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190703 states. [2020-07-20 23:01:21,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190703 states to 190703 states and 304734 transitions. [2020-07-20 23:01:21,170 INFO L78 Accepts]: Start accepts. Automaton has 190703 states and 304734 transitions. Word has length 480 [2020-07-20 23:01:21,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:01:21,170 INFO L479 AbstractCegarLoop]: Abstraction has 190703 states and 304734 transitions. [2020-07-20 23:01:21,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:01:21,170 INFO L276 IsEmpty]: Start isEmpty. Operand 190703 states and 304734 transitions. [2020-07-20 23:01:21,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-20 23:01:21,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:01:21,325 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] [2020-07-20 23:01:21,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:01:21,526 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:01:21,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:01:21,527 INFO L82 PathProgramCache]: Analyzing trace with hash 2141967130, now seen corresponding path program 1 times [2020-07-20 23:01:21,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:01:21,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149039279] [2020-07-20 23:01:21,528 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:01:21,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:01:21,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:01:21,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 1649 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:01:21,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:01:22,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:01:22,101 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:01:22,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149039279] [2020-07-20 23:01:22,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:01:22,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:01:22,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234782609] [2020-07-20 23:01:22,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:01:22,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:01:22,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:01:22,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:01:22,104 INFO L87 Difference]: Start difference. First operand 190703 states and 304734 transitions. Second operand 3 states. [2020-07-20 23:01:42,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:01:42,970 INFO L93 Difference]: Finished difference Result 546843 states and 874776 transitions. [2020-07-20 23:01:42,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:01:42,971 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-20 23:01:42,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:01:43,504 INFO L225 Difference]: With dead ends: 546843 [2020-07-20 23:01:43,505 INFO L226 Difference]: Without dead ends: 369036 [2020-07-20 23:01:43,631 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 [2020-07-20 23:01:43,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369036 states. [2020-07-20 23:02:05,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369036 to 369015. [2020-07-20 23:02:05,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369015 states. [2020-07-20 23:02:05,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369015 states to 369015 states and 587734 transitions. [2020-07-20 23:02:05,986 INFO L78 Accepts]: Start accepts. Automaton has 369015 states and 587734 transitions. Word has length 481 [2020-07-20 23:02:05,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:02:05,986 INFO L479 AbstractCegarLoop]: Abstraction has 369015 states and 587734 transitions. [2020-07-20 23:02:05,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:02:05,986 INFO L276 IsEmpty]: Start isEmpty. Operand 369015 states and 587734 transitions. [2020-07-20 23:02:06,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 23:02:06,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:02:06,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:02:06,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:02:06,480 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:02:06,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:02:06,480 INFO L82 PathProgramCache]: Analyzing trace with hash -387614886, now seen corresponding path program 1 times [2020-07-20 23:02:06,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:02:06,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428098754] [2020-07-20 23:02:06,482 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:02:06,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:02:06,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:02:06,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:02:06,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:02:06,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:02:06,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:02:06,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428098754] [2020-07-20 23:02:06,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:02:06,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:02:06,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586840346] [2020-07-20 23:02:06,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:02:06,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:02:06,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:02:06,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:02:06,910 INFO L87 Difference]: Start difference. First operand 369015 states and 587734 transitions. Second operand 3 states. [2020-07-20 23:02:52,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:02:52,002 INFO L93 Difference]: Finished difference Result 1094645 states and 1744070 transitions. [2020-07-20 23:02:52,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:02:52,003 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-20 23:02:52,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:02:52,960 INFO L225 Difference]: With dead ends: 1094645 [2020-07-20 23:02:52,961 INFO L226 Difference]: Without dead ends: 729624 [2020-07-20 23:02:53,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:02:53,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 729624 states. [2020-07-20 23:03:23,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 729624 to 369045. [2020-07-20 23:03:23,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369045 states. [2020-07-20 23:03:24,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369045 states to 369045 states and 587354 transitions. [2020-07-20 23:03:24,006 INFO L78 Accepts]: Start accepts. Automaton has 369045 states and 587354 transitions. Word has length 483 [2020-07-20 23:03:24,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:03:24,006 INFO L479 AbstractCegarLoop]: Abstraction has 369045 states and 587354 transitions. [2020-07-20 23:03:24,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:03:24,007 INFO L276 IsEmpty]: Start isEmpty. Operand 369045 states and 587354 transitions. [2020-07-20 23:03:24,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-20 23:03:24,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:03:24,350 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:03:24,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:03:24,550 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:03:24,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:03:24,551 INFO L82 PathProgramCache]: Analyzing trace with hash 115222580, now seen corresponding path program 1 times [2020-07-20 23:03:24,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:03:24,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948406538] [2020-07-20 23:03:24,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:03:24,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:03:24,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:03:24,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:03:24,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:03:25,012 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:03:25,013 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:03:25,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948406538] [2020-07-20 23:03:25,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:03:25,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:03:25,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092947580] [2020-07-20 23:03:25,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:03:25,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:03:25,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:03:25,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:03:25,015 INFO L87 Difference]: Start difference. First operand 369045 states and 587354 transitions. Second operand 4 states. [2020-07-20 23:04:10,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:04:10,308 INFO L93 Difference]: Finished difference Result 1084091 states and 1725144 transitions. [2020-07-20 23:04:10,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:04:10,309 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 484 [2020-07-20 23:04:10,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:04:11,263 INFO L225 Difference]: With dead ends: 1084091 [2020-07-20 23:04:11,263 INFO L226 Difference]: Without dead ends: 728372 [2020-07-20 23:04:12,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:04:12,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728372 states. [2020-07-20 23:05:10,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728372 to 728358. [2020-07-20 23:05:10,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 728358 states. [2020-07-20 23:05:12,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 728358 states to 728358 states and 1152300 transitions. [2020-07-20 23:05:12,104 INFO L78 Accepts]: Start accepts. Automaton has 728358 states and 1152300 transitions. Word has length 484 [2020-07-20 23:05:12,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:05:12,104 INFO L479 AbstractCegarLoop]: Abstraction has 728358 states and 1152300 transitions. [2020-07-20 23:05:12,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:05:12,104 INFO L276 IsEmpty]: Start isEmpty. Operand 728358 states and 1152300 transitions. [2020-07-20 23:05:14,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-20 23:05:14,107 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:05:14,107 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:05:14,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:14,308 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:05:14,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:05:14,309 INFO L82 PathProgramCache]: Analyzing trace with hash 542062103, now seen corresponding path program 1 times [2020-07-20 23:05:14,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:05:14,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884910843] [2020-07-20 23:05:14,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:05:14,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:05:14,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:05:14,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 1648 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:05:14,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:05:14,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:05:14,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:05:14,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884910843] [2020-07-20 23:05:14,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:05:14,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:05:14,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312799775] [2020-07-20 23:05:14,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:05:14,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:05:14,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:05:14,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:05:14,816 INFO L87 Difference]: Start difference. First operand 728358 states and 1152300 transitions. Second operand 4 states. [2020-07-20 23:06:49,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:06:49,897 INFO L93 Difference]: Finished difference Result 2010160 states and 3167672 transitions. [2020-07-20 23:06:49,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:06:49,898 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 484 [2020-07-20 23:06:49,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:06:52,195 INFO L225 Difference]: With dead ends: 2010160 [2020-07-20 23:06:52,195 INFO L226 Difference]: Without dead ends: 1383089 [2020-07-20 23:06:52,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:06:54,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1383089 states. [2020-07-20 23:08:14,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1383089 to 812898. [2020-07-20 23:08:14,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 812898 states. [2020-07-20 23:08:17,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812898 states to 812898 states and 1297086 transitions. [2020-07-20 23:08:17,571 INFO L78 Accepts]: Start accepts. Automaton has 812898 states and 1297086 transitions. Word has length 484 [2020-07-20 23:08:17,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:08:17,571 INFO L479 AbstractCegarLoop]: Abstraction has 812898 states and 1297086 transitions. [2020-07-20 23:08:17,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:08:17,571 INFO L276 IsEmpty]: Start isEmpty. Operand 812898 states and 1297086 transitions. [2020-07-20 23:08:18,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 23:08:18,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:08:18,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:08:18,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:08:18,660 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:08:18,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:08:18,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1936447930, now seen corresponding path program 1 times [2020-07-20 23:08:18,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:08:18,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125176771] [2020-07-20 23:08:18,662 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:08:18,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:08:18,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:08:18,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 1437 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:08:18,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:08:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:08:19,097 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:08:19,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125176771] [2020-07-20 23:08:19,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:08:19,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:08:19,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570164291] [2020-07-20 23:08:19,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:08:19,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:08:19,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:08:19,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:08:19,099 INFO L87 Difference]: Start difference. First operand 812898 states and 1297086 transitions. Second operand 3 states.