/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:28:35,211 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:28:35,213 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:28:35,224 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:28:35,224 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:28:35,225 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:28:35,227 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:28:35,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:28:35,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:28:35,231 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:28:35,232 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:28:35,233 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:28:35,233 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:28:35,234 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:28:35,235 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:28:35,236 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:28:35,237 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:28:35,238 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:28:35,240 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:28:35,242 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:28:35,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:28:35,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:28:35,245 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:28:35,246 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:28:35,249 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 12:28:35,249 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 12:28:35,249 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 12:28:35,250 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 12:28:35,251 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 12:28:35,252 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-20 12:28:35,256 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:28:35,257 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:28:35,258 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:28:35,259 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 12:28:35,273 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:28:35,273 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:28:35,275 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:28:35,275 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:28:35,275 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:28:35,275 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:28:35,275 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:28:35,276 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:28:35,277 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:28:35,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:28:35,277 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:28:35,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:28:35,277 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:28:35,278 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:28:35,278 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:28:35,278 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:28:35,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:28:35,278 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:28:35,279 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:28:35,279 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:28:35,279 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:28:35,279 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:35,279 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:28:35,280 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:28:35,280 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 12:28:35,547 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:28:35,560 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:28:35,564 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:28:35,565 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:28:35,565 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:28:35,566 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:28:35,635 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90e662c10/11b09579a89e4b6d8a7b812a7345d87e/FLAG985e6e7cb [2020-07-20 12:28:36,336 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:28:36,337 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:28:36,368 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90e662c10/11b09579a89e4b6d8a7b812a7345d87e/FLAG985e6e7cb [2020-07-20 12:28:36,460 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/90e662c10/11b09579a89e4b6d8a7b812a7345d87e [2020-07-20 12:28:36,471 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:28:36,474 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:28:36,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:28:36,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:28:36,484 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:28:36,486 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:28:36" (1/1) ... [2020-07-20 12:28:36,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c9c0b22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:36, skipping insertion in model container [2020-07-20 12:28:36,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:28:36" (1/1) ... [2020-07-20 12:28:36,498 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:28:36,678 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:28:38,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:28:38,172 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:28:39,572 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:28:39,621 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:28:39,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39 WrapperNode [2020-07-20 12:28:39,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:28:39,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:28:39,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:28:39,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:28:39,646 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,719 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,720 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,860 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,873 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... [2020-07-20 12:28:39,891 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:28:39,892 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:28:39,892 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:28:39,892 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:28:39,893 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:28:39,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:28:39,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:28:39,966 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:28:39,966 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:28:39,967 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:28:39,967 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 12:28:39,967 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 12:28:39,967 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 12:28:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:28:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:28:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 12:28:39,968 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 12:28:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 12:28:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 12:28:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 12:28:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 12:28:39,969 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 12:28:39,970 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 12:28:39,970 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 12:28:39,970 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:28:39,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:28:39,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:28:43,555 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:28:43,555 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 12:28:43,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:28:43 BoogieIcfgContainer [2020-07-20 12:28:43,571 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:28:43,572 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:28:43,572 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:28:43,575 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:28:43,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:28:36" (1/3) ... [2020-07-20 12:28:43,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@575c3832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:28:43, skipping insertion in model container [2020-07-20 12:28:43,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:28:39" (2/3) ... [2020-07-20 12:28:43,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@575c3832 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:28:43, skipping insertion in model container [2020-07-20 12:28:43,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:28:43" (3/3) ... [2020-07-20 12:28:43,580 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:28:43,591 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:28:43,601 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:28:43,615 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:28:43,647 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:28:43,647 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:28:43,647 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:28:43,647 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:28:43,647 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:28:43,648 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:28:43,648 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:28:43,648 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:28:43,690 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-07-20 12:28:43,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 12:28:43,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:43,733 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 12:28:43,734 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:43,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:43,740 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-07-20 12:28:43,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:43,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [362083995] [2020-07-20 12:28:43,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:44,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:44,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 2945 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 12:28:44,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:44,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:44,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:44,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [362083995] [2020-07-20 12:28:44,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:44,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:44,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794025888] [2020-07-20 12:28:44,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:44,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:44,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:44,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:44,652 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 3 states. [2020-07-20 12:28:45,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:45,025 INFO L93 Difference]: Finished difference Result 2212 states and 3947 transitions. [2020-07-20 12:28:45,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:45,028 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 467 [2020-07-20 12:28:45,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:45,060 INFO L225 Difference]: With dead ends: 2212 [2020-07-20 12:28:45,060 INFO L226 Difference]: Without dead ends: 1956 [2020-07-20 12:28:45,067 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 12:28:45,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1956 states. [2020-07-20 12:28:45,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954. [2020-07-20 12:28:45,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1954 states. [2020-07-20 12:28:45,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions. [2020-07-20 12:28:45,248 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467 [2020-07-20 12:28:45,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:45,253 INFO L479 AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions. [2020-07-20 12:28:45,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:45,254 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions. [2020-07-20 12:28:45,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 12:28:45,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:45,268 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 12:28:45,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:45,482 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:45,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:45,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times [2020-07-20 12:28:45,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:45,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254874964] [2020-07-20 12:28:45,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:46,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:46,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 2946 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:28:46,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:46,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:46,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:46,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254874964] [2020-07-20 12:28:46,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:46,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:28:46,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706083725] [2020-07-20 12:28:46,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:28:46,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:46,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:28:46,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:28:46,371 INFO L87 Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 4 states. [2020-07-20 12:28:46,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:46,718 INFO L93 Difference]: Finished difference Result 5793 states and 9438 transitions. [2020-07-20 12:28:46,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:28:46,718 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-07-20 12:28:46,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:46,739 INFO L225 Difference]: With dead ends: 5793 [2020-07-20 12:28:46,739 INFO L226 Difference]: Without dead ends: 3856 [2020-07-20 12:28:46,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:28:46,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3856 states. [2020-07-20 12:28:46,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854. [2020-07-20 12:28:46,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3854 states. [2020-07-20 12:28:46,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions. [2020-07-20 12:28:46,913 INFO L78 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467 [2020-07-20 12:28:46,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:46,914 INFO L479 AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions. [2020-07-20 12:28:46,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:28:46,914 INFO L276 IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions. [2020-07-20 12:28:46,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 12:28:46,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:46,931 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 12:28:47,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:47,147 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:47,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:47,148 INFO L82 PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times [2020-07-20 12:28:47,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:47,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546212386] [2020-07-20 12:28:47,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:47,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:47,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 2949 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:47,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:47,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:47,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:47,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546212386] [2020-07-20 12:28:47,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:47,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:47,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002737091] [2020-07-20 12:28:47,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:47,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:47,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:47,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:47,850 INFO L87 Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 3 states. [2020-07-20 12:28:48,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:48,295 INFO L93 Difference]: Finished difference Result 11260 states and 18231 transitions. [2020-07-20 12:28:48,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:48,296 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 469 [2020-07-20 12:28:48,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:48,344 INFO L225 Difference]: With dead ends: 11260 [2020-07-20 12:28:48,344 INFO L226 Difference]: Without dead ends: 7620 [2020-07-20 12:28:48,357 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 12:28:48,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7620 states. [2020-07-20 12:28:48,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7620 to 7618. [2020-07-20 12:28:48,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7618 states. [2020-07-20 12:28:48,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7618 states to 7618 states and 12321 transitions. [2020-07-20 12:28:48,861 INFO L78 Accepts]: Start accepts. Automaton has 7618 states and 12321 transitions. Word has length 469 [2020-07-20 12:28:48,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:48,861 INFO L479 AbstractCegarLoop]: Abstraction has 7618 states and 12321 transitions. [2020-07-20 12:28:48,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:48,862 INFO L276 IsEmpty]: Start isEmpty. Operand 7618 states and 12321 transitions. [2020-07-20 12:28:48,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 12:28:48,880 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:48,881 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 12:28:49,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:49,094 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:49,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:49,095 INFO L82 PathProgramCache]: Analyzing trace with hash -269242540, now seen corresponding path program 1 times [2020-07-20 12:28:49,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:49,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572450809] [2020-07-20 12:28:49,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:49,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:49,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 2951 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:49,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:49,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:49,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:49,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572450809] [2020-07-20 12:28:49,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:49,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:49,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277690761] [2020-07-20 12:28:49,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:49,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:49,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:49,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:49,754 INFO L87 Difference]: Start difference. First operand 7618 states and 12321 transitions. Second operand 3 states. [2020-07-20 12:28:50,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:50,201 INFO L93 Difference]: Finished difference Result 22757 states and 36795 transitions. [2020-07-20 12:28:50,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:50,202 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 470 [2020-07-20 12:28:50,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:50,269 INFO L225 Difference]: With dead ends: 22757 [2020-07-20 12:28:50,270 INFO L226 Difference]: Without dead ends: 15191 [2020-07-20 12:28:50,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:50,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15191 states. [2020-07-20 12:28:50,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15191 to 7665. [2020-07-20 12:28:50,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7665 states. [2020-07-20 12:28:50,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7665 states to 7665 states and 12395 transitions. [2020-07-20 12:28:50,806 INFO L78 Accepts]: Start accepts. Automaton has 7665 states and 12395 transitions. Word has length 470 [2020-07-20 12:28:50,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:50,806 INFO L479 AbstractCegarLoop]: Abstraction has 7665 states and 12395 transitions. [2020-07-20 12:28:50,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:50,806 INFO L276 IsEmpty]: Start isEmpty. Operand 7665 states and 12395 transitions. [2020-07-20 12:28:50,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2020-07-20 12:28:50,825 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:50,825 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:28:51,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:51,039 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:51,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:51,040 INFO L82 PathProgramCache]: Analyzing trace with hash -335154176, now seen corresponding path program 1 times [2020-07-20 12:28:51,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:51,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252750838] [2020-07-20 12:28:51,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:51,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:51,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 2952 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:51,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:52,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:52,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:52,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252750838] [2020-07-20 12:28:52,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:52,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:52,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716438943] [2020-07-20 12:28:52,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:52,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:52,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:52,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:52,301 INFO L87 Difference]: Start difference. First operand 7665 states and 12395 transitions. Second operand 3 states. [2020-07-20 12:28:52,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:52,928 INFO L93 Difference]: Finished difference Result 22272 states and 35912 transitions. [2020-07-20 12:28:52,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:52,928 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 471 [2020-07-20 12:28:52,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:52,970 INFO L225 Difference]: With dead ends: 22272 [2020-07-20 12:28:52,970 INFO L226 Difference]: Without dead ends: 15006 [2020-07-20 12:28:52,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:53,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15006 states. [2020-07-20 12:28:53,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15006 to 15004. [2020-07-20 12:28:53,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15004 states. [2020-07-20 12:28:53,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15004 states to 15004 states and 24145 transitions. [2020-07-20 12:28:53,626 INFO L78 Accepts]: Start accepts. Automaton has 15004 states and 24145 transitions. Word has length 471 [2020-07-20 12:28:53,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:53,626 INFO L479 AbstractCegarLoop]: Abstraction has 15004 states and 24145 transitions. [2020-07-20 12:28:53,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:53,631 INFO L276 IsEmpty]: Start isEmpty. Operand 15004 states and 24145 transitions. [2020-07-20 12:28:53,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2020-07-20 12:28:53,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:53,664 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:28:53,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:53,879 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:53,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:53,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1765810725, now seen corresponding path program 1 times [2020-07-20 12:28:53,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:53,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575888444] [2020-07-20 12:28:53,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:54,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 2954 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:54,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:54,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:54,450 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:54,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575888444] [2020-07-20 12:28:54,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:54,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:54,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485592550] [2020-07-20 12:28:54,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:54,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:54,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:54,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:54,464 INFO L87 Difference]: Start difference. First operand 15004 states and 24145 transitions. Second operand 3 states. [2020-07-20 12:28:55,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:55,104 INFO L93 Difference]: Finished difference Result 44756 states and 71990 transitions. [2020-07-20 12:28:55,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:55,105 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 471 [2020-07-20 12:28:55,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:55,180 INFO L225 Difference]: With dead ends: 44756 [2020-07-20 12:28:55,180 INFO L226 Difference]: Without dead ends: 29896 [2020-07-20 12:28:55,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:55,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29896 states. [2020-07-20 12:28:55,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29896 to 15102. [2020-07-20 12:28:55,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15102 states. [2020-07-20 12:28:55,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15102 states to 15102 states and 24296 transitions. [2020-07-20 12:28:55,871 INFO L78 Accepts]: Start accepts. Automaton has 15102 states and 24296 transitions. Word has length 471 [2020-07-20 12:28:55,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:55,872 INFO L479 AbstractCegarLoop]: Abstraction has 15102 states and 24296 transitions. [2020-07-20 12:28:55,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:55,872 INFO L276 IsEmpty]: Start isEmpty. Operand 15102 states and 24296 transitions. [2020-07-20 12:28:55,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2020-07-20 12:28:55,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:55,905 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 12:28:56,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:56,120 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:56,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:56,120 INFO L82 PathProgramCache]: Analyzing trace with hash 2067493155, now seen corresponding path program 1 times [2020-07-20 12:28:56,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:56,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198919407] [2020-07-20 12:28:56,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:56,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:56,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 2955 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:56,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:56,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:56,726 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:56,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198919407] [2020-07-20 12:28:56,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:56,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:56,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88600420] [2020-07-20 12:28:56,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:56,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:56,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:56,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:56,728 INFO L87 Difference]: Start difference. First operand 15102 states and 24296 transitions. Second operand 3 states. [2020-07-20 12:28:57,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:28:57,368 INFO L93 Difference]: Finished difference Result 44891 states and 72171 transitions. [2020-07-20 12:28:57,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:28:57,368 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 472 [2020-07-20 12:28:57,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:28:57,437 INFO L225 Difference]: With dead ends: 44891 [2020-07-20 12:28:57,437 INFO L226 Difference]: Without dead ends: 30013 [2020-07-20 12:28:57,463 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 12:28:57,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30013 states. [2020-07-20 12:28:58,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30013 to 15219. [2020-07-20 12:28:58,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15219 states. [2020-07-20 12:28:58,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15219 states to 15219 states and 24442 transitions. [2020-07-20 12:28:58,116 INFO L78 Accepts]: Start accepts. Automaton has 15219 states and 24442 transitions. Word has length 472 [2020-07-20 12:28:58,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:28:58,117 INFO L479 AbstractCegarLoop]: Abstraction has 15219 states and 24442 transitions. [2020-07-20 12:28:58,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:28:58,117 INFO L276 IsEmpty]: Start isEmpty. Operand 15219 states and 24442 transitions. [2020-07-20 12:28:58,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 12:28:58,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:28:58,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:28:58,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:58,346 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:28:58,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:28:58,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1974730661, now seen corresponding path program 1 times [2020-07-20 12:28:58,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:28:58,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325305863] [2020-07-20 12:28:58,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:28:58,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:28:58,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 2955 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:28:58,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:28:59,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:28:59,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:28:59,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325305863] [2020-07-20 12:28:59,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:28:59,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:28:59,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373684910] [2020-07-20 12:28:59,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:28:59,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:28:59,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:28:59,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:28:59,272 INFO L87 Difference]: Start difference. First operand 15219 states and 24442 transitions. Second operand 3 states. [2020-07-20 12:29:00,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:00,051 INFO L93 Difference]: Finished difference Result 43846 states and 70265 transitions. [2020-07-20 12:29:00,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:00,051 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 473 [2020-07-20 12:29:00,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:00,096 INFO L225 Difference]: With dead ends: 43846 [2020-07-20 12:29:00,097 INFO L226 Difference]: Without dead ends: 29596 [2020-07-20 12:29:00,128 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 12:29:00,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29596 states. [2020-07-20 12:29:01,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29596 to 29594. [2020-07-20 12:29:01,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29594 states. [2020-07-20 12:29:01,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29594 states to 29594 states and 47307 transitions. [2020-07-20 12:29:01,912 INFO L78 Accepts]: Start accepts. Automaton has 29594 states and 47307 transitions. Word has length 473 [2020-07-20 12:29:01,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:01,912 INFO L479 AbstractCegarLoop]: Abstraction has 29594 states and 47307 transitions. [2020-07-20 12:29:01,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:01,913 INFO L276 IsEmpty]: Start isEmpty. Operand 29594 states and 47307 transitions. [2020-07-20 12:29:01,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 12:29:01,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:01,937 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:02,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:02,144 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:02,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:02,145 INFO L82 PathProgramCache]: Analyzing trace with hash -382866648, now seen corresponding path program 1 times [2020-07-20 12:29:02,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:02,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422286467] [2020-07-20 12:29:02,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:02,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 2956 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:29:02,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:02,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:02,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:02,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422286467] [2020-07-20 12:29:02,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:02,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:29:02,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088311491] [2020-07-20 12:29:02,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:29:02,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:02,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:29:02,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:29:02,749 INFO L87 Difference]: Start difference. First operand 29594 states and 47307 transitions. Second operand 4 states. [2020-07-20 12:29:04,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:04,180 INFO L93 Difference]: Finished difference Result 83580 states and 133043 transitions. [2020-07-20 12:29:04,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:29:04,181 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 473 [2020-07-20 12:29:04,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:04,258 INFO L225 Difference]: With dead ends: 83580 [2020-07-20 12:29:04,258 INFO L226 Difference]: Without dead ends: 56266 [2020-07-20 12:29:04,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 470 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:29:04,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56266 states. [2020-07-20 12:29:05,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56266 to 30887. [2020-07-20 12:29:05,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30887 states. [2020-07-20 12:29:05,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30887 states to 30887 states and 49586 transitions. [2020-07-20 12:29:05,720 INFO L78 Accepts]: Start accepts. Automaton has 30887 states and 49586 transitions. Word has length 473 [2020-07-20 12:29:05,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:05,720 INFO L479 AbstractCegarLoop]: Abstraction has 30887 states and 49586 transitions. [2020-07-20 12:29:05,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:29:05,720 INFO L276 IsEmpty]: Start isEmpty. Operand 30887 states and 49586 transitions. [2020-07-20 12:29:05,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 12:29:05,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:05,745 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:05,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:05,961 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:05,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:05,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1912996694, now seen corresponding path program 1 times [2020-07-20 12:29:05,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:05,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577525197] [2020-07-20 12:29:05,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:06,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:06,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 2963 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:06,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:06,559 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 12:29:06,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:06,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577525197] [2020-07-20 12:29:06,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:06,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:06,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959084918] [2020-07-20 12:29:06,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:06,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:06,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:06,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:06,562 INFO L87 Difference]: Start difference. First operand 30887 states and 49586 transitions. Second operand 3 states. [2020-07-20 12:29:08,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:08,650 INFO L93 Difference]: Finished difference Result 85630 states and 136255 transitions. [2020-07-20 12:29:08,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:08,650 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 476 [2020-07-20 12:29:08,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:08,711 INFO L225 Difference]: With dead ends: 85630 [2020-07-20 12:29:08,711 INFO L226 Difference]: Without dead ends: 58296 [2020-07-20 12:29:08,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:08,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58296 states. [2020-07-20 12:29:10,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58296 to 31334. [2020-07-20 12:29:10,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31334 states. [2020-07-20 12:29:10,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31334 states to 31334 states and 50261 transitions. [2020-07-20 12:29:10,077 INFO L78 Accepts]: Start accepts. Automaton has 31334 states and 50261 transitions. Word has length 476 [2020-07-20 12:29:10,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:10,077 INFO L479 AbstractCegarLoop]: Abstraction has 31334 states and 50261 transitions. [2020-07-20 12:29:10,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:10,077 INFO L276 IsEmpty]: Start isEmpty. Operand 31334 states and 50261 transitions. [2020-07-20 12:29:10,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-20 12:29:10,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:10,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:10,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:10,323 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:10,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:10,324 INFO L82 PathProgramCache]: Analyzing trace with hash -1584229236, now seen corresponding path program 1 times [2020-07-20 12:29:10,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:10,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154861242] [2020-07-20 12:29:10,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:10,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:10,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 2964 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:10,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:10,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:10,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:10,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154861242] [2020-07-20 12:29:10,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:10,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:10,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387685662] [2020-07-20 12:29:10,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:10,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:10,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:10,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:10,913 INFO L87 Difference]: Start difference. First operand 31334 states and 50261 transitions. Second operand 3 states. [2020-07-20 12:29:12,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:12,662 INFO L93 Difference]: Finished difference Result 86359 states and 137304 transitions. [2020-07-20 12:29:12,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:12,663 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-20 12:29:12,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:12,723 INFO L225 Difference]: With dead ends: 86359 [2020-07-20 12:29:12,723 INFO L226 Difference]: Without dead ends: 58911 [2020-07-20 12:29:12,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:12,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58911 states. [2020-07-20 12:29:15,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58911 to 31981. [2020-07-20 12:29:15,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31981 states. [2020-07-20 12:29:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31981 states to 31981 states and 51201 transitions. [2020-07-20 12:29:15,356 INFO L78 Accepts]: Start accepts. Automaton has 31981 states and 51201 transitions. Word has length 477 [2020-07-20 12:29:15,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:15,357 INFO L479 AbstractCegarLoop]: Abstraction has 31981 states and 51201 transitions. [2020-07-20 12:29:15,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:15,357 INFO L276 IsEmpty]: Start isEmpty. Operand 31981 states and 51201 transitions. [2020-07-20 12:29:15,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 12:29:15,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:15,379 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:15,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:15,593 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:15,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:15,594 INFO L82 PathProgramCache]: Analyzing trace with hash 545046366, now seen corresponding path program 1 times [2020-07-20 12:29:15,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:15,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441519037] [2020-07-20 12:29:15,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:16,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:16,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 2965 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:16,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:16,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:16,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441519037] [2020-07-20 12:29:16,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:16,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:16,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84068088] [2020-07-20 12:29:16,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:16,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:16,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:16,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:16,174 INFO L87 Difference]: Start difference. First operand 31981 states and 51201 transitions. Second operand 3 states. [2020-07-20 12:29:18,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:18,074 INFO L93 Difference]: Finished difference Result 87271 states and 138488 transitions. [2020-07-20 12:29:18,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:29:18,074 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 12:29:18,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:18,126 INFO L225 Difference]: With dead ends: 87271 [2020-07-20 12:29:18,126 INFO L226 Difference]: Without dead ends: 59765 [2020-07-20 12:29:18,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:18,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59765 states. [2020-07-20 12:29:19,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59765 to 32835. [2020-07-20 12:29:19,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32835 states. [2020-07-20 12:29:19,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32835 states to 32835 states and 52263 transitions. [2020-07-20 12:29:19,433 INFO L78 Accepts]: Start accepts. Automaton has 32835 states and 52263 transitions. Word has length 478 [2020-07-20 12:29:19,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:19,434 INFO L479 AbstractCegarLoop]: Abstraction has 32835 states and 52263 transitions. [2020-07-20 12:29:19,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:29:19,434 INFO L276 IsEmpty]: Start isEmpty. Operand 32835 states and 52263 transitions. [2020-07-20 12:29:19,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 12:29:19,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:19,457 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:19,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:19,658 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:19,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:19,659 INFO L82 PathProgramCache]: Analyzing trace with hash 355992395, now seen corresponding path program 1 times [2020-07-20 12:29:19,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:19,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704604326] [2020-07-20 12:29:19,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:20,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:20,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 2975 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:29:20,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:20,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:20,676 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:20,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704604326] [2020-07-20 12:29:20,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:20,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 12:29:20,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474457540] [2020-07-20 12:29:20,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 12:29:20,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:20,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 12:29:20,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:29:20,678 INFO L87 Difference]: Start difference. First operand 32835 states and 52263 transitions. Second operand 5 states. [2020-07-20 12:29:23,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:23,074 INFO L93 Difference]: Finished difference Result 54061 states and 85216 transitions. [2020-07-20 12:29:23,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 12:29:23,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 479 [2020-07-20 12:29:23,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:23,121 INFO L225 Difference]: With dead ends: 54061 [2020-07-20 12:29:23,121 INFO L226 Difference]: Without dead ends: 32835 [2020-07-20 12:29:23,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 475 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:29:23,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32835 states. [2020-07-20 12:29:25,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32835 to 32835. [2020-07-20 12:29:25,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32835 states. [2020-07-20 12:29:25,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32835 states to 32835 states and 51871 transitions. [2020-07-20 12:29:25,339 INFO L78 Accepts]: Start accepts. Automaton has 32835 states and 51871 transitions. Word has length 479 [2020-07-20 12:29:25,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:25,339 INFO L479 AbstractCegarLoop]: Abstraction has 32835 states and 51871 transitions. [2020-07-20 12:29:25,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 12:29:25,339 INFO L276 IsEmpty]: Start isEmpty. Operand 32835 states and 51871 transitions. [2020-07-20 12:29:25,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 12:29:25,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:25,362 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:25,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:25,562 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:25,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:25,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1017913424, now seen corresponding path program 1 times [2020-07-20 12:29:25,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:25,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648832618] [2020-07-20 12:29:25,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:26,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:26,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 2978 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 12:29:26,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:26,350 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-07-20 12:29:27,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:27,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:27,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648832618] [2020-07-20 12:29:27,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:27,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2020-07-20 12:29:27,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797914507] [2020-07-20 12:29:27,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 12:29:27,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:27,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 12:29:27,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2020-07-20 12:29:27,247 INFO L87 Difference]: Start difference. First operand 32835 states and 51871 transitions. Second operand 17 states. [2020-07-20 12:29:38,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:38,225 INFO L93 Difference]: Finished difference Result 74954 states and 117087 transitions. [2020-07-20 12:29:38,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 12:29:38,226 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 479 [2020-07-20 12:29:38,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:38,293 INFO L225 Difference]: With dead ends: 74954 [2020-07-20 12:29:38,294 INFO L226 Difference]: Without dead ends: 68288 [2020-07-20 12:29:38,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 463 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 12:29:38,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68288 states. [2020-07-20 12:29:40,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68288 to 35431. [2020-07-20 12:29:40,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35431 states. [2020-07-20 12:29:40,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35431 states to 35431 states and 55667 transitions. [2020-07-20 12:29:40,428 INFO L78 Accepts]: Start accepts. Automaton has 35431 states and 55667 transitions. Word has length 479 [2020-07-20 12:29:40,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:40,429 INFO L479 AbstractCegarLoop]: Abstraction has 35431 states and 55667 transitions. [2020-07-20 12:29:40,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 12:29:40,429 INFO L276 IsEmpty]: Start isEmpty. Operand 35431 states and 55667 transitions. [2020-07-20 12:29:40,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 12:29:40,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:40,455 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:29:40,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:40,656 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:40,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:40,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1908068521, now seen corresponding path program 1 times [2020-07-20 12:29:40,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:40,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797724180] [2020-07-20 12:29:40,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:41,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:41,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 2976 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:29:41,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:41,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:41,428 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:41,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797724180] [2020-07-20 12:29:41,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:41,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:29:41,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964039718] [2020-07-20 12:29:41,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:29:41,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:41,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:29:41,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:29:41,430 INFO L87 Difference]: Start difference. First operand 35431 states and 55667 transitions. Second operand 4 states. [2020-07-20 12:29:45,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:29:45,375 INFO L93 Difference]: Finished difference Result 104299 states and 163896 transitions. [2020-07-20 12:29:45,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:29:45,375 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-20 12:29:45,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:29:45,439 INFO L225 Difference]: With dead ends: 104299 [2020-07-20 12:29:45,440 INFO L226 Difference]: Without dead ends: 69131 [2020-07-20 12:29:45,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:29:45,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69131 states. [2020-07-20 12:29:50,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69131 to 69129. [2020-07-20 12:29:50,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69129 states. [2020-07-20 12:29:50,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69129 states to 69129 states and 108187 transitions. [2020-07-20 12:29:50,869 INFO L78 Accepts]: Start accepts. Automaton has 69129 states and 108187 transitions. Word has length 479 [2020-07-20 12:29:50,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:29:50,870 INFO L479 AbstractCegarLoop]: Abstraction has 69129 states and 108187 transitions. [2020-07-20 12:29:50,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:29:50,870 INFO L276 IsEmpty]: Start isEmpty. Operand 69129 states and 108187 transitions. [2020-07-20 12:29:50,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-20 12:29:50,921 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:29:50,922 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 12:29:51,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:51,135 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:29:51,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:29:51,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1705678533, now seen corresponding path program 1 times [2020-07-20 12:29:51,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:29:51,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298785136] [2020-07-20 12:29:51,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:29:51,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:29:51,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 2979 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:29:51,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:29:51,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:29:51,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:29:51,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298785136] [2020-07-20 12:29:51,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:29:51,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:29:51,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452147628] [2020-07-20 12:29:51,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:29:51,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:29:51,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:29:51,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:29:51,842 INFO L87 Difference]: Start difference. First operand 69129 states and 108187 transitions. Second operand 3 states. [2020-07-20 12:30:01,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:30:01,562 INFO L93 Difference]: Finished difference Result 200827 states and 313184 transitions. [2020-07-20 12:30:01,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:30:01,563 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-20 12:30:01,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:30:01,699 INFO L225 Difference]: With dead ends: 200827 [2020-07-20 12:30:01,699 INFO L226 Difference]: Without dead ends: 135266 [2020-07-20 12:30:01,752 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 12:30:01,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135266 states. [2020-07-20 12:30:09,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135266 to 135264. [2020-07-20 12:30:09,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135264 states. [2020-07-20 12:30:09,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135264 states to 135264 states and 210445 transitions. [2020-07-20 12:30:09,916 INFO L78 Accepts]: Start accepts. Automaton has 135264 states and 210445 transitions. Word has length 481 [2020-07-20 12:30:09,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:30:09,917 INFO L479 AbstractCegarLoop]: Abstraction has 135264 states and 210445 transitions. [2020-07-20 12:30:09,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:30:09,917 INFO L276 IsEmpty]: Start isEmpty. Operand 135264 states and 210445 transitions. [2020-07-20 12:30:10,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-20 12:30:10,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:30:10,033 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, 1, 1, 1, 1, 1] [2020-07-20 12:30:10,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:10,234 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:30:10,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:30:10,234 INFO L82 PathProgramCache]: Analyzing trace with hash -965322689, now seen corresponding path program 1 times [2020-07-20 12:30:10,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:30:10,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151555388] [2020-07-20 12:30:10,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:10,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:30:10,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 2970 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:30:10,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:30:10,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:30:10,929 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:30:10,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151555388] [2020-07-20 12:30:10,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:30:10,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:30:10,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846955054] [2020-07-20 12:30:10,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:30:10,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:30:10,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:30:10,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:30:10,931 INFO L87 Difference]: Start difference. First operand 135264 states and 210445 transitions. Second operand 3 states. [2020-07-20 12:30:28,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:30:28,187 INFO L93 Difference]: Finished difference Result 397448 states and 617337 transitions. [2020-07-20 12:30:28,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:30:28,187 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-20 12:30:28,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:30:28,788 INFO L225 Difference]: With dead ends: 397448 [2020-07-20 12:30:28,789 INFO L226 Difference]: Without dead ends: 266198 [2020-07-20 12:30:28,894 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 12:30:29,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266198 states. [2020-07-20 12:30:49,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266198 to 266196. [2020-07-20 12:30:49,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266196 states. [2020-07-20 12:30:52,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266196 states to 266196 states and 412215 transitions. [2020-07-20 12:30:52,766 INFO L78 Accepts]: Start accepts. Automaton has 266196 states and 412215 transitions. Word has length 481 [2020-07-20 12:30:52,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:30:52,766 INFO L479 AbstractCegarLoop]: Abstraction has 266196 states and 412215 transitions. [2020-07-20 12:30:52,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:30:52,767 INFO L276 IsEmpty]: Start isEmpty. Operand 266196 states and 412215 transitions. [2020-07-20 12:30:52,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 12:30:52,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:30:52,986 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:30:53,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:53,187 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:30:53,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:30:53,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1236102340, now seen corresponding path program 1 times [2020-07-20 12:30:53,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:30:53,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055295527] [2020-07-20 12:30:53,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:30:53,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:30:53,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 2973 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:30:53,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:30:53,827 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 12:30:53,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:30:53,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055295527] [2020-07-20 12:30:53,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:30:53,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:30:53,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266430660] [2020-07-20 12:30:53,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:30:53,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:30:53,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:30:53,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:30:53,830 INFO L87 Difference]: Start difference. First operand 266196 states and 412215 transitions. Second operand 3 states. [2020-07-20 12:31:30,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:31:30,164 INFO L93 Difference]: Finished difference Result 777731 states and 1201310 transitions. [2020-07-20 12:31:30,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:31:30,165 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-20 12:31:30,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:31:31,273 INFO L225 Difference]: With dead ends: 777731 [2020-07-20 12:31:31,273 INFO L226 Difference]: Without dead ends: 523211 [2020-07-20 12:31:31,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:31:31,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523211 states. [2020-07-20 12:32:19,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523211 to 523209. [2020-07-20 12:32:19,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 523209 states. [2020-07-20 12:32:20,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523209 states to 523209 states and 805938 transitions. [2020-07-20 12:32:20,446 INFO L78 Accepts]: Start accepts. Automaton has 523209 states and 805938 transitions. Word has length 483 [2020-07-20 12:32:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:32:20,446 INFO L479 AbstractCegarLoop]: Abstraction has 523209 states and 805938 transitions. [2020-07-20 12:32:20,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:32:20,446 INFO L276 IsEmpty]: Start isEmpty. Operand 523209 states and 805938 transitions. [2020-07-20 12:32:20,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 12:32:20,941 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:32:20,941 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:32:21,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:21,142 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:32:21,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:32:21,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1332731591, now seen corresponding path program 1 times [2020-07-20 12:32:21,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:32:21,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889777392] [2020-07-20 12:32:21,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:32:21,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:32:21,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 2974 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:32:21,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:32:21,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:32:21,754 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:32:21,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889777392] [2020-07-20 12:32:21,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:32:21,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:32:21,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819389593] [2020-07-20 12:32:21,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:32:21,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:32:21,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:32:21,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:32:21,756 INFO L87 Difference]: Start difference. First operand 523209 states and 805938 transitions. Second operand 4 states. [2020-07-20 12:33:44,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:33:44,381 INFO L93 Difference]: Finished difference Result 1457055 states and 2235208 transitions. [2020-07-20 12:33:44,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:33:44,382 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 483 [2020-07-20 12:33:44,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:33:45,756 INFO L225 Difference]: With dead ends: 1457055 [2020-07-20 12:33:45,756 INFO L226 Difference]: Without dead ends: 973149 [2020-07-20 12:33:46,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:33:46,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973149 states. [2020-07-20 12:34:42,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973149 to 537573. [2020-07-20 12:34:42,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 537573 states. [2020-07-20 12:34:43,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537573 states to 537573 states and 831499 transitions. [2020-07-20 12:34:43,253 INFO L78 Accepts]: Start accepts. Automaton has 537573 states and 831499 transitions. Word has length 483 [2020-07-20 12:34:43,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:34:43,254 INFO L479 AbstractCegarLoop]: Abstraction has 537573 states and 831499 transitions. [2020-07-20 12:34:43,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:34:43,254 INFO L276 IsEmpty]: Start isEmpty. Operand 537573 states and 831499 transitions. [2020-07-20 12:34:43,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 12:34:43,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:34:43,820 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:34:44,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:34:44,033 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:34:44,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:34:44,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1445880981, now seen corresponding path program 1 times [2020-07-20 12:34:44,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:34:44,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794768811] [2020-07-20 12:34:44,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:34:44,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:34:44,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 2982 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:34:44,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:34:44,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:34:44,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:34:44,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794768811] [2020-07-20 12:34:44,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:34:44,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:34:44,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425358141] [2020-07-20 12:34:44,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:34:44,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:34:44,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:34:44,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:34:44,630 INFO L87 Difference]: Start difference. First operand 537573 states and 831499 transitions. Second operand 4 states. [2020-07-20 12:36:11,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:11,086 INFO L93 Difference]: Finished difference Result 1387652 states and 2122458 transitions. [2020-07-20 12:36:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:36:11,086 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 487 [2020-07-20 12:36:11,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:12,462 INFO L225 Difference]: With dead ends: 1387652 [2020-07-20 12:36:12,462 INFO L226 Difference]: Without dead ends: 970818 [2020-07-20 12:36:12,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:36:13,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970818 states. [2020-07-20 12:37:24,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970818 to 583962. [2020-07-20 12:37:24,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 583962 states. [2020-07-20 12:37:25,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 583962 states to 583962 states and 909601 transitions. [2020-07-20 12:37:25,523 INFO L78 Accepts]: Start accepts. Automaton has 583962 states and 909601 transitions. Word has length 487 [2020-07-20 12:37:25,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:25,523 INFO L479 AbstractCegarLoop]: Abstraction has 583962 states and 909601 transitions. [2020-07-20 12:37:25,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:37:25,524 INFO L276 IsEmpty]: Start isEmpty. Operand 583962 states and 909601 transitions. [2020-07-20 12:37:26,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 12:37:26,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:26,125 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:26,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:26,326 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:26,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:26,327 INFO L82 PathProgramCache]: Analyzing trace with hash 390651312, now seen corresponding path program 1 times [2020-07-20 12:37:26,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:26,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838104254] [2020-07-20 12:37:26,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:26,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:26,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 2995 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:26,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:27,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:27,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838104254] [2020-07-20 12:37:27,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:27,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:27,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197840536] [2020-07-20 12:37:27,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:27,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:27,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:27,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:27,708 INFO L87 Difference]: Start difference. First operand 583962 states and 909601 transitions. Second operand 3 states. [2020-07-20 12:38:56,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:38:56,629 INFO L93 Difference]: Finished difference Result 1512356 states and 2345385 transitions. [2020-07-20 12:38:56,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:38:56,630 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 12:38:56,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:38:58,106 INFO L225 Difference]: With dead ends: 1512356 [2020-07-20 12:38:58,106 INFO L226 Difference]: Without dead ends: 1047846 [2020-07-20 12:38:58,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:38:59,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1047846 states.