/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 17:26:06,296 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 17:26:06,299 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 17:26:06,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 17:26:06,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 17:26:06,314 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 17:26:06,315 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 17:26:06,317 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 17:26:06,319 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 17:26:06,320 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 17:26:06,321 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 17:26:06,322 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 17:26:06,323 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 17:26:06,324 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 17:26:06,325 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 17:26:06,326 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 17:26:06,327 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 17:26:06,328 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 17:26:06,330 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 17:26:06,332 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 17:26:06,336 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 17:26:06,339 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 17:26:06,341 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 17:26:06,341 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 17:26:06,346 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 17:26:06,349 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 17:26:06,349 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 17:26:06,350 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 17:26:06,351 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 17:26:06,354 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 17:26:06,354 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 17:26:06,355 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 17:26:06,355 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 17:26:06,356 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 17:26:06,359 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 17:26:06,359 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 17:26:06,361 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 17:26:06,361 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 17:26:06,361 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 17:26:06,362 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 17:26:06,364 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 17:26:06,365 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 17:26:06,392 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 17:26:06,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 17:26:06,397 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 17:26:06,397 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 17:26:06,397 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 17:26:06,397 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 17:26:06,398 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 17:26:06,398 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 17:26:06,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 17:26:06,398 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 17:26:06,399 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 17:26:06,400 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 17:26:06,400 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 17:26:06,400 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 17:26:06,400 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 17:26:06,401 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 17:26:06,401 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 17:26:06,401 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 17:26:06,401 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 17:26:06,401 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 17:26:06,402 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 17:26:06,402 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:26:06,402 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 17:26:06,403 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 17:26:06,403 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 17:26:06,403 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 17:26:06,403 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:06,403 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 17:26:06,404 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 17:26:06,404 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 17:26:06,705 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 17:26:06,719 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 17:26:06,723 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 17:26:06,724 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 17:26:06,725 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 17:26:06,725 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 17:26:06,791 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0564e60/ab25c46fed05469ca50e37ab202b7e68/FLAGba6c2b61e [2020-07-21 17:26:07,451 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 17:26:07,451 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 17:26:07,469 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0564e60/ab25c46fed05469ca50e37ab202b7e68/FLAGba6c2b61e [2020-07-21 17:26:07,544 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe0564e60/ab25c46fed05469ca50e37ab202b7e68 [2020-07-21 17:26:07,557 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 17:26:07,561 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 17:26:07,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 17:26:07,566 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 17:26:07,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 17:26:07,571 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:26:07" (1/1) ... [2020-07-21 17:26:07,574 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cbb1bac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:07, skipping insertion in model container [2020-07-21 17:26:07,575 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:26:07" (1/1) ... [2020-07-21 17:26:07,581 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 17:26:07,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 17:26:08,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:26:08,867 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 17:26:09,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:26:09,323 INFO L208 MainTranslator]: Completed translation [2020-07-21 17:26:09,324 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09 WrapperNode [2020-07-21 17:26:09,324 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 17:26:09,325 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 17:26:09,325 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 17:26:09,325 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 17:26:09,346 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,376 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,376 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,445 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,474 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,483 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... [2020-07-21 17:26:09,499 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 17:26:09,500 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 17:26:09,500 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 17:26:09,500 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 17:26:09,503 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:26:09,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 17:26:09,616 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 17:26:09,616 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 17:26:09,616 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 17:26:09,616 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 17:26:09,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 17:26:09,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 17:26:09,617 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 17:26:09,618 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 17:26:09,618 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 17:26:09,619 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 17:26:09,619 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 17:26:09,619 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 17:26:09,619 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 17:26:09,619 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 17:26:09,620 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 17:26:09,620 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 17:26:09,621 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 17:26:09,621 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 17:26:09,621 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 17:26:09,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 17:26:09,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 17:26:12,227 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 17:26:12,227 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 17:26:12,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:26:12 BoogieIcfgContainer [2020-07-21 17:26:12,239 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 17:26:12,240 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 17:26:12,240 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 17:26:12,244 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 17:26:12,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:26:07" (1/3) ... [2020-07-21 17:26:12,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62bb1da3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:26:12, skipping insertion in model container [2020-07-21 17:26:12,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:26:09" (2/3) ... [2020-07-21 17:26:12,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62bb1da3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:26:12, skipping insertion in model container [2020-07-21 17:26:12,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:26:12" (3/3) ... [2020-07-21 17:26:12,248 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 17:26:12,259 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 17:26:12,268 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 17:26:12,283 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 17:26:12,313 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 17:26:12,313 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 17:26:12,314 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 17:26:12,314 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 17:26:12,314 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 17:26:12,314 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 17:26:12,314 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 17:26:12,314 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 17:26:12,348 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states. [2020-07-21 17:26:12,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:12,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:12,380 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] [2020-07-21 17:26:12,381 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:12,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:12,388 INFO L82 PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times [2020-07-21 17:26:12,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:12,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164308920] [2020-07-21 17:26:12,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:12,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:12,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:12,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:26:12,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:13,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:13,141 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:13,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164308920] [2020-07-21 17:26:13,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:13,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:13,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566236073] [2020-07-21 17:26:13,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:13,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:13,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:13,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:13,168 INFO L87 Difference]: Start difference. First operand 796 states. Second operand 3 states. [2020-07-21 17:26:13,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:13,470 INFO L93 Difference]: Finished difference Result 1140 states and 1981 transitions. [2020-07-21 17:26:13,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:13,473 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 318 [2020-07-21 17:26:13,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:13,504 INFO L225 Difference]: With dead ends: 1140 [2020-07-21 17:26:13,504 INFO L226 Difference]: Without dead ends: 973 [2020-07-21 17:26:13,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:13,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973 states. [2020-07-21 17:26:13,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973 to 971. [2020-07-21 17:26:13,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 971 states. [2020-07-21 17:26:13,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 971 states to 971 states and 1536 transitions. [2020-07-21 17:26:13,673 INFO L78 Accepts]: Start accepts. Automaton has 971 states and 1536 transitions. Word has length 318 [2020-07-21 17:26:13,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:13,677 INFO L479 AbstractCegarLoop]: Abstraction has 971 states and 1536 transitions. [2020-07-21 17:26:13,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:13,678 INFO L276 IsEmpty]: Start isEmpty. Operand 971 states and 1536 transitions. [2020-07-21 17:26:13,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:13,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:13,692 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] [2020-07-21 17:26:13,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:13,907 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:13,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:13,909 INFO L82 PathProgramCache]: Analyzing trace with hash -566193409, now seen corresponding path program 1 times [2020-07-21 17:26:13,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:13,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579112309] [2020-07-21 17:26:13,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:14,262 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:14,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:14,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 1102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 17:26:14,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:14,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:14,363 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:14,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579112309] [2020-07-21 17:26:14,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:14,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:14,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452519785] [2020-07-21 17:26:14,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:14,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:14,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:14,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:14,367 INFO L87 Difference]: Start difference. First operand 971 states and 1536 transitions. Second operand 3 states. [2020-07-21 17:26:14,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:14,593 INFO L93 Difference]: Finished difference Result 1980 states and 3152 transitions. [2020-07-21 17:26:14,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:14,594 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 318 [2020-07-21 17:26:14,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:14,604 INFO L225 Difference]: With dead ends: 1980 [2020-07-21 17:26:14,604 INFO L226 Difference]: Without dead ends: 1621 [2020-07-21 17:26:14,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:14,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1621 states. [2020-07-21 17:26:14,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1621 to 1615. [2020-07-21 17:26:14,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1615 states. [2020-07-21 17:26:14,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1615 states to 1615 states and 2552 transitions. [2020-07-21 17:26:14,724 INFO L78 Accepts]: Start accepts. Automaton has 1615 states and 2552 transitions. Word has length 318 [2020-07-21 17:26:14,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:14,725 INFO L479 AbstractCegarLoop]: Abstraction has 1615 states and 2552 transitions. [2020-07-21 17:26:14,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:14,726 INFO L276 IsEmpty]: Start isEmpty. Operand 1615 states and 2552 transitions. [2020-07-21 17:26:14,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:14,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:14,733 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] [2020-07-21 17:26:14,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:14,947 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:14,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:14,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1708782165, now seen corresponding path program 1 times [2020-07-21 17:26:14,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:14,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869928579] [2020-07-21 17:26:14,949 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:15,219 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:15,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:15,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 1102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 17:26:15,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:15,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:15,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:15,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869928579] [2020-07-21 17:26:15,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:15,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:15,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947526641] [2020-07-21 17:26:15,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:15,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:15,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:15,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:15,380 INFO L87 Difference]: Start difference. First operand 1615 states and 2552 transitions. Second operand 3 states. [2020-07-21 17:26:15,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:15,644 INFO L93 Difference]: Finished difference Result 3566 states and 5678 transitions. [2020-07-21 17:26:15,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:15,644 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 318 [2020-07-21 17:26:15,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:15,662 INFO L225 Difference]: With dead ends: 3566 [2020-07-21 17:26:15,662 INFO L226 Difference]: Without dead ends: 2865 [2020-07-21 17:26:15,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:15,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2865 states. [2020-07-21 17:26:15,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2865 to 2861. [2020-07-21 17:26:15,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2861 states. [2020-07-21 17:26:15,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2861 states to 2861 states and 4513 transitions. [2020-07-21 17:26:15,818 INFO L78 Accepts]: Start accepts. Automaton has 2861 states and 4513 transitions. Word has length 318 [2020-07-21 17:26:15,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:15,818 INFO L479 AbstractCegarLoop]: Abstraction has 2861 states and 4513 transitions. [2020-07-21 17:26:15,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:15,819 INFO L276 IsEmpty]: Start isEmpty. Operand 2861 states and 4513 transitions. [2020-07-21 17:26:15,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:15,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:15,828 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] [2020-07-21 17:26:16,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:16,044 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:16,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:16,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times [2020-07-21 17:26:16,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:16,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270769227] [2020-07-21 17:26:16,047 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:16,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:16,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:16,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 17:26:16,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:16,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:16,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:16,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270769227] [2020-07-21 17:26:16,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:16,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:16,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20658214] [2020-07-21 17:26:16,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:16,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:16,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:16,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:16,497 INFO L87 Difference]: Start difference. First operand 2861 states and 4513 transitions. Second operand 3 states. [2020-07-21 17:26:16,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:16,821 INFO L93 Difference]: Finished difference Result 6627 states and 10550 transitions. [2020-07-21 17:26:16,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:16,821 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 318 [2020-07-21 17:26:16,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:16,849 INFO L225 Difference]: With dead ends: 6627 [2020-07-21 17:26:16,850 INFO L226 Difference]: Without dead ends: 5351 [2020-07-21 17:26:16,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:16,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5351 states. [2020-07-21 17:26:17,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5351 to 5345. [2020-07-21 17:26:17,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5345 states. [2020-07-21 17:26:17,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5345 states to 5345 states and 8418 transitions. [2020-07-21 17:26:17,098 INFO L78 Accepts]: Start accepts. Automaton has 5345 states and 8418 transitions. Word has length 318 [2020-07-21 17:26:17,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:17,099 INFO L479 AbstractCegarLoop]: Abstraction has 5345 states and 8418 transitions. [2020-07-21 17:26:17,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:17,099 INFO L276 IsEmpty]: Start isEmpty. Operand 5345 states and 8418 transitions. [2020-07-21 17:26:17,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:17,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:17,110 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] [2020-07-21 17:26:17,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:17,325 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:17,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:17,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times [2020-07-21 17:26:17,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:17,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532047456] [2020-07-21 17:26:17,328 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:17,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:17,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:17,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 17:26:17,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:17,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:17,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532047456] [2020-07-21 17:26:17,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:17,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:17,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53262473] [2020-07-21 17:26:17,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:17,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:17,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:17,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:17,779 INFO L87 Difference]: Start difference. First operand 5345 states and 8418 transitions. Second operand 3 states. [2020-07-21 17:26:18,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:18,191 INFO L93 Difference]: Finished difference Result 12705 states and 20210 transitions. [2020-07-21 17:26:18,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:18,191 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 318 [2020-07-21 17:26:18,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:18,241 INFO L225 Difference]: With dead ends: 12705 [2020-07-21 17:26:18,242 INFO L226 Difference]: Without dead ends: 10260 [2020-07-21 17:26:18,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:18,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10260 states. [2020-07-21 17:26:18,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10260 to 10250. [2020-07-21 17:26:18,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10250 states. [2020-07-21 17:26:18,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10250 states to 10250 states and 16118 transitions. [2020-07-21 17:26:18,812 INFO L78 Accepts]: Start accepts. Automaton has 10250 states and 16118 transitions. Word has length 318 [2020-07-21 17:26:18,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:18,813 INFO L479 AbstractCegarLoop]: Abstraction has 10250 states and 16118 transitions. [2020-07-21 17:26:18,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:18,814 INFO L276 IsEmpty]: Start isEmpty. Operand 10250 states and 16118 transitions. [2020-07-21 17:26:18,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 17:26:18,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:18,831 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] [2020-07-21 17:26:19,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:19,045 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:19,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:19,045 INFO L82 PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times [2020-07-21 17:26:19,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:19,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477126315] [2020-07-21 17:26:19,046 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:19,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:26:19,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:19,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 2043 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:26:19,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:19,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:19,577 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:19,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477126315] [2020-07-21 17:26:19,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:19,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:26:19,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753180164] [2020-07-21 17:26:19,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:26:19,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:19,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:26:19,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:26:19,580 INFO L87 Difference]: Start difference. First operand 10250 states and 16118 transitions. Second operand 4 states. [2020-07-21 17:26:20,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:20,293 INFO L93 Difference]: Finished difference Result 30304 states and 47605 transitions. [2020-07-21 17:26:20,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:26:20,294 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-07-21 17:26:20,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:20,360 INFO L225 Difference]: With dead ends: 30304 [2020-07-21 17:26:20,361 INFO L226 Difference]: Without dead ends: 20071 [2020-07-21 17:26:20,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 315 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:26:20,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20071 states. [2020-07-21 17:26:21,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20071 to 20069. [2020-07-21 17:26:21,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20069 states. [2020-07-21 17:26:21,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20069 states to 20069 states and 31370 transitions. [2020-07-21 17:26:21,275 INFO L78 Accepts]: Start accepts. Automaton has 20069 states and 31370 transitions. Word has length 318 [2020-07-21 17:26:21,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:21,275 INFO L479 AbstractCegarLoop]: Abstraction has 20069 states and 31370 transitions. [2020-07-21 17:26:21,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:26:21,276 INFO L276 IsEmpty]: Start isEmpty. Operand 20069 states and 31370 transitions. [2020-07-21 17:26:21,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-21 17:26:21,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:21,305 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] [2020-07-21 17:26:21,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:21,519 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:21,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:21,520 INFO L82 PathProgramCache]: Analyzing trace with hash 493862517, now seen corresponding path program 1 times [2020-07-21 17:26:21,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:21,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846168930] [2020-07-21 17:26:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:21,883 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:26:21,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:21,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 2046 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:26:21,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:22,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:22,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846168930] [2020-07-21 17:26:22,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:22,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:22,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907836868] [2020-07-21 17:26:22,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:22,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:22,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:22,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:22,031 INFO L87 Difference]: Start difference. First operand 20069 states and 31370 transitions. Second operand 3 states. [2020-07-21 17:26:23,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:23,607 INFO L93 Difference]: Finished difference Result 59239 states and 92476 transitions. [2020-07-21 17:26:23,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:23,608 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 320 [2020-07-21 17:26:23,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:23,723 INFO L225 Difference]: With dead ends: 59239 [2020-07-21 17:26:23,724 INFO L226 Difference]: Without dead ends: 39272 [2020-07-21 17:26:23,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:23,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39272 states. [2020-07-21 17:26:24,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39272 to 39270. [2020-07-21 17:26:24,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39270 states. [2020-07-21 17:26:25,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39270 states to 39270 states and 60995 transitions. [2020-07-21 17:26:25,046 INFO L78 Accepts]: Start accepts. Automaton has 39270 states and 60995 transitions. Word has length 320 [2020-07-21 17:26:25,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:25,046 INFO L479 AbstractCegarLoop]: Abstraction has 39270 states and 60995 transitions. [2020-07-21 17:26:25,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:25,046 INFO L276 IsEmpty]: Start isEmpty. Operand 39270 states and 60995 transitions. [2020-07-21 17:26:25,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-21 17:26:25,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:25,090 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] [2020-07-21 17:26:25,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:25,304 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:25,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:25,305 INFO L82 PathProgramCache]: Analyzing trace with hash -706692038, now seen corresponding path program 1 times [2020-07-21 17:26:25,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:25,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368497494] [2020-07-21 17:26:25,306 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:25,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:25,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:25,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:26:25,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:25,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:25,833 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:25,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368497494] [2020-07-21 17:26:25,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:25,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:25,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299888854] [2020-07-21 17:26:25,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:25,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:25,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:25,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:25,836 INFO L87 Difference]: Start difference. First operand 39270 states and 60995 transitions. Second operand 3 states. [2020-07-21 17:26:27,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:27,222 INFO L93 Difference]: Finished difference Result 117778 states and 182936 transitions. [2020-07-21 17:26:27,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:27,223 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 320 [2020-07-21 17:26:27,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:27,389 INFO L225 Difference]: With dead ends: 117778 [2020-07-21 17:26:27,389 INFO L226 Difference]: Without dead ends: 78523 [2020-07-21 17:26:27,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:27,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78523 states. [2020-07-21 17:26:30,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78523 to 39281. [2020-07-21 17:26:30,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39281 states. [2020-07-21 17:26:30,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39281 states to 39281 states and 61011 transitions. [2020-07-21 17:26:30,199 INFO L78 Accepts]: Start accepts. Automaton has 39281 states and 61011 transitions. Word has length 320 [2020-07-21 17:26:30,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:30,199 INFO L479 AbstractCegarLoop]: Abstraction has 39281 states and 61011 transitions. [2020-07-21 17:26:30,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:30,199 INFO L276 IsEmpty]: Start isEmpty. Operand 39281 states and 61011 transitions. [2020-07-21 17:26:30,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2020-07-21 17:26:30,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:30,229 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] [2020-07-21 17:26:30,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:30,431 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:30,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:30,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1827093772, now seen corresponding path program 1 times [2020-07-21 17:26:30,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:30,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701929852] [2020-07-21 17:26:30,433 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:31,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:26:31,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:31,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 2048 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:26:31,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:31,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:31,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:31,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701929852] [2020-07-21 17:26:31,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:31,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:31,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913426827] [2020-07-21 17:26:31,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:31,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:31,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:31,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:31,140 INFO L87 Difference]: Start difference. First operand 39281 states and 61011 transitions. Second operand 3 states. [2020-07-21 17:26:32,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:32,912 INFO L93 Difference]: Finished difference Result 117735 states and 182854 transitions. [2020-07-21 17:26:32,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:32,912 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 321 [2020-07-21 17:26:32,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:33,036 INFO L225 Difference]: With dead ends: 117735 [2020-07-21 17:26:33,037 INFO L226 Difference]: Without dead ends: 78484 [2020-07-21 17:26:33,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:33,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78484 states. [2020-07-21 17:26:35,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78484 to 39291. [2020-07-21 17:26:35,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39291 states. [2020-07-21 17:26:35,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39291 states to 39291 states and 61025 transitions. [2020-07-21 17:26:35,966 INFO L78 Accepts]: Start accepts. Automaton has 39291 states and 61025 transitions. Word has length 321 [2020-07-21 17:26:35,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:35,967 INFO L479 AbstractCegarLoop]: Abstraction has 39291 states and 61025 transitions. [2020-07-21 17:26:35,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:35,967 INFO L276 IsEmpty]: Start isEmpty. Operand 39291 states and 61025 transitions. [2020-07-21 17:26:35,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 17:26:35,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:35,986 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] [2020-07-21 17:26:36,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:36,187 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:36,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:36,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1489239216, now seen corresponding path program 1 times [2020-07-21 17:26:36,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:36,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84156980] [2020-07-21 17:26:36,189 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:36,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:26:36,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:36,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 2049 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:26:36,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:36,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:36,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:36,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84156980] [2020-07-21 17:26:36,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:36,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:26:36,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294141318] [2020-07-21 17:26:36,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:26:36,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:36,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:26:36,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:36,649 INFO L87 Difference]: Start difference. First operand 39291 states and 61025 transitions. Second operand 3 states. [2020-07-21 17:26:38,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:38,391 INFO L93 Difference]: Finished difference Result 111654 states and 173151 transitions. [2020-07-21 17:26:38,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:26:38,391 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 322 [2020-07-21 17:26:38,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:38,497 INFO L225 Difference]: With dead ends: 111654 [2020-07-21 17:26:38,497 INFO L226 Difference]: Without dead ends: 72558 [2020-07-21 17:26:38,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:26:38,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72558 states. [2020-07-21 17:26:42,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72558 to 72556. [2020-07-21 17:26:42,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72556 states. [2020-07-21 17:26:42,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72556 states to 72556 states and 111880 transitions. [2020-07-21 17:26:42,704 INFO L78 Accepts]: Start accepts. Automaton has 72556 states and 111880 transitions. Word has length 322 [2020-07-21 17:26:42,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:42,705 INFO L479 AbstractCegarLoop]: Abstraction has 72556 states and 111880 transitions. [2020-07-21 17:26:42,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:26:42,705 INFO L276 IsEmpty]: Start isEmpty. Operand 72556 states and 111880 transitions. [2020-07-21 17:26:42,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 17:26:42,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:42,748 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] [2020-07-21 17:26:42,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:42,954 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:42,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:42,955 INFO L82 PathProgramCache]: Analyzing trace with hash -525325363, now seen corresponding path program 1 times [2020-07-21 17:26:42,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:42,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426709808] [2020-07-21 17:26:42,956 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:43,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:43,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:43,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 17:26:43,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:43,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:43,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:43,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426709808] [2020-07-21 17:26:43,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:43,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:26:43,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538770010] [2020-07-21 17:26:43,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:26:43,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:43,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:26:43,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:26:43,270 INFO L87 Difference]: Start difference. First operand 72556 states and 111880 transitions. Second operand 4 states. [2020-07-21 17:26:47,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:26:47,211 INFO L93 Difference]: Finished difference Result 212300 states and 327142 transitions. [2020-07-21 17:26:47,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:26:47,212 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 322 [2020-07-21 17:26:47,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:26:47,400 INFO L225 Difference]: With dead ends: 212300 [2020-07-21 17:26:47,400 INFO L226 Difference]: Without dead ends: 140190 [2020-07-21 17:26:47,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:26:47,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140190 states. [2020-07-21 17:26:52,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140190 to 72770. [2020-07-21 17:26:52,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72770 states. [2020-07-21 17:26:52,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72770 states to 72770 states and 112244 transitions. [2020-07-21 17:26:52,666 INFO L78 Accepts]: Start accepts. Automaton has 72770 states and 112244 transitions. Word has length 322 [2020-07-21 17:26:52,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:26:52,666 INFO L479 AbstractCegarLoop]: Abstraction has 72770 states and 112244 transitions. [2020-07-21 17:26:52,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:26:52,666 INFO L276 IsEmpty]: Start isEmpty. Operand 72770 states and 112244 transitions. [2020-07-21 17:26:52,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 17:26:52,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:26:52,719 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] [2020-07-21 17:26:52,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:52,931 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:26:52,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:26:52,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1979364594, now seen corresponding path program 1 times [2020-07-21 17:26:52,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:26:52,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643665418] [2020-07-21 17:26:52,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:26:53,162 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:26:53,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:26:53,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 1121 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 17:26:53,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:26:53,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:26:53,327 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:26:53,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643665418] [2020-07-21 17:26:53,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:26:53,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 17:26:53,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556335064] [2020-07-21 17:26:53,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 17:26:53,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:26:53,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 17:26:53,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 17:26:53,332 INFO L87 Difference]: Start difference. First operand 72770 states and 112244 transitions. Second operand 9 states. [2020-07-21 17:27:21,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:27:21,993 INFO L93 Difference]: Finished difference Result 640839 states and 1008203 transitions. [2020-07-21 17:27:21,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 17:27:21,994 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 324 [2020-07-21 17:27:21,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:27:22,871 INFO L225 Difference]: With dead ends: 640839 [2020-07-21 17:27:22,871 INFO L226 Difference]: Without dead ends: 617161 [2020-07-21 17:27:23,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 17:27:23,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617161 states. [2020-07-21 17:27:46,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617161 to 256879. [2020-07-21 17:27:46,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256879 states. [2020-07-21 17:27:46,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256879 states to 256879 states and 401798 transitions. [2020-07-21 17:27:46,586 INFO L78 Accepts]: Start accepts. Automaton has 256879 states and 401798 transitions. Word has length 324 [2020-07-21 17:27:46,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:27:46,587 INFO L479 AbstractCegarLoop]: Abstraction has 256879 states and 401798 transitions. [2020-07-21 17:27:46,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 17:27:46,588 INFO L276 IsEmpty]: Start isEmpty. Operand 256879 states and 401798 transitions. [2020-07-21 17:27:46,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 17:27:46,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:27:46,710 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] [2020-07-21 17:27:46,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:27:46,911 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:27:46,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:27:46,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1800002030, now seen corresponding path program 1 times [2020-07-21 17:27:46,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:27:46,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410673418] [2020-07-21 17:27:46,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:27:47,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:27:47,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:27:47,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 2061 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 17:27:47,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:27:47,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:27:47,518 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:27:47,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410673418] [2020-07-21 17:27:47,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:27:47,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 17:27:47,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684577838] [2020-07-21 17:27:47,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 17:27:47,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:27:47,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 17:27:47,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 17:27:47,524 INFO L87 Difference]: Start difference. First operand 256879 states and 401798 transitions. Second operand 8 states. [2020-07-21 17:28:11,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:28:11,849 INFO L93 Difference]: Finished difference Result 463266 states and 728844 transitions. [2020-07-21 17:28:11,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 17:28:11,850 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 324 [2020-07-21 17:28:11,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:28:12,406 INFO L225 Difference]: With dead ends: 463266 [2020-07-21 17:28:12,407 INFO L226 Difference]: Without dead ends: 321187 [2020-07-21 17:28:12,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 17:28:12,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321187 states. [2020-07-21 17:28:21,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321187 to 123038. [2020-07-21 17:28:21,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123038 states. [2020-07-21 17:28:21,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123038 states to 123038 states and 189636 transitions. [2020-07-21 17:28:21,745 INFO L78 Accepts]: Start accepts. Automaton has 123038 states and 189636 transitions. Word has length 324 [2020-07-21 17:28:21,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:28:21,745 INFO L479 AbstractCegarLoop]: Abstraction has 123038 states and 189636 transitions. [2020-07-21 17:28:21,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 17:28:21,746 INFO L276 IsEmpty]: Start isEmpty. Operand 123038 states and 189636 transitions. [2020-07-21 17:28:21,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 17:28:21,796 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:28:21,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:28:22,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:28:22,005 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:28:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:28:22,006 INFO L82 PathProgramCache]: Analyzing trace with hash -101182738, now seen corresponding path program 1 times [2020-07-21 17:28:22,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:28:22,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456875274] [2020-07-21 17:28:22,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:28:22,367 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:28:22,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:28:22,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 2058 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:28:22,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:28:22,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:28:22,449 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:28:22,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456875274] [2020-07-21 17:28:22,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:28:22,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:28:22,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452197054] [2020-07-21 17:28:22,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:28:22,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:28:22,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:28:22,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:28:22,451 INFO L87 Difference]: Start difference. First operand 123038 states and 189636 transitions. Second operand 3 states. [2020-07-21 17:28:34,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:28:34,646 INFO L93 Difference]: Finished difference Result 292059 states and 453076 transitions. [2020-07-21 17:28:34,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:28:34,647 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 324 [2020-07-21 17:28:34,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:28:34,889 INFO L225 Difference]: With dead ends: 292059 [2020-07-21 17:28:34,889 INFO L226 Difference]: Without dead ends: 170556 [2020-07-21 17:28:34,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:28:35,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170556 states. [2020-07-21 17:28:48,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170556 to 159354. [2020-07-21 17:28:48,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159354 states. [2020-07-21 17:28:48,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159354 states to 159354 states and 247704 transitions. [2020-07-21 17:28:48,947 INFO L78 Accepts]: Start accepts. Automaton has 159354 states and 247704 transitions. Word has length 324 [2020-07-21 17:28:48,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:28:48,947 INFO L479 AbstractCegarLoop]: Abstraction has 159354 states and 247704 transitions. [2020-07-21 17:28:48,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:28:48,947 INFO L276 IsEmpty]: Start isEmpty. Operand 159354 states and 247704 transitions. [2020-07-21 17:28:49,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 17:28:49,003 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:28:49,003 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] [2020-07-21 17:28:49,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:28:49,204 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:28:49,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:28:49,205 INFO L82 PathProgramCache]: Analyzing trace with hash -615713349, now seen corresponding path program 1 times [2020-07-21 17:28:49,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:28:49,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786852256] [2020-07-21 17:28:49,206 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:28:49,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:28:49,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:28:49,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:28:49,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:28:49,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:28:49,519 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:28:49,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786852256] [2020-07-21 17:28:49,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:28:49,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:28:49,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137150283] [2020-07-21 17:28:49,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:28:49,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:28:49,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:28:49,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:28:49,523 INFO L87 Difference]: Start difference. First operand 159354 states and 247704 transitions. Second operand 3 states. [2020-07-21 17:29:12,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:29:12,000 INFO L93 Difference]: Finished difference Result 476770 states and 740816 transitions. [2020-07-21 17:29:12,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:29:12,001 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 324 [2020-07-21 17:29:12,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:29:12,500 INFO L225 Difference]: With dead ends: 476770 [2020-07-21 17:29:12,500 INFO L226 Difference]: Without dead ends: 318058 [2020-07-21 17:29:12,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:29:12,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318058 states. [2020-07-21 17:29:26,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318058 to 159451. [2020-07-21 17:29:26,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159451 states. [2020-07-21 17:29:27,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159451 states to 159451 states and 247834 transitions. [2020-07-21 17:29:27,279 INFO L78 Accepts]: Start accepts. Automaton has 159451 states and 247834 transitions. Word has length 324 [2020-07-21 17:29:27,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:29:27,279 INFO L479 AbstractCegarLoop]: Abstraction has 159451 states and 247834 transitions. [2020-07-21 17:29:27,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:29:27,280 INFO L276 IsEmpty]: Start isEmpty. Operand 159451 states and 247834 transitions. [2020-07-21 17:29:27,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 17:29:27,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:29:27,336 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] [2020-07-21 17:29:27,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:29:27,537 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:29:27,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:29:27,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1806571032, now seen corresponding path program 1 times [2020-07-21 17:29:27,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:29:27,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957211243] [2020-07-21 17:29:27,539 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:29:27,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:29:27,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:29:27,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 1481 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:29:27,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:29:27,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:29:27,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:29:27,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957211243] [2020-07-21 17:29:27,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:29:27,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:29:27,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103676578] [2020-07-21 17:29:27,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:29:27,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:29:27,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:29:27,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:29:27,910 INFO L87 Difference]: Start difference. First operand 159451 states and 247834 transitions. Second operand 4 states. [2020-07-21 17:29:41,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:29:41,749 INFO L93 Difference]: Finished difference Result 320333 states and 497859 transitions. [2020-07-21 17:29:41,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:29:41,749 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 325 [2020-07-21 17:29:41,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:29:42,206 INFO L225 Difference]: With dead ends: 320333 [2020-07-21 17:29:42,206 INFO L226 Difference]: Without dead ends: 160174 [2020-07-21 17:29:42,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:29:42,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160174 states. [2020-07-21 17:29:52,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160174 to 160172. [2020-07-21 17:29:52,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160172 states. [2020-07-21 17:29:53,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160172 states to 160172 states and 247801 transitions. [2020-07-21 17:29:53,134 INFO L78 Accepts]: Start accepts. Automaton has 160172 states and 247801 transitions. Word has length 325 [2020-07-21 17:29:53,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:29:53,134 INFO L479 AbstractCegarLoop]: Abstraction has 160172 states and 247801 transitions. [2020-07-21 17:29:53,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:29:53,135 INFO L276 IsEmpty]: Start isEmpty. Operand 160172 states and 247801 transitions. [2020-07-21 17:29:53,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 17:29:53,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:29:53,192 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] [2020-07-21 17:29:53,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:29:53,407 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:29:53,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:29:53,408 INFO L82 PathProgramCache]: Analyzing trace with hash -430794005, now seen corresponding path program 1 times [2020-07-21 17:29:53,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:29:53,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404147452] [2020-07-21 17:29:53,409 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:29:53,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:29:53,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:29:53,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 17:29:53,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:29:54,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:29:54,202 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:29:54,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404147452] [2020-07-21 17:29:54,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:29:54,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 17:29:54,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571946154] [2020-07-21 17:29:54,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 17:29:54,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:29:54,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 17:29:54,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 17:29:54,206 INFO L87 Difference]: Start difference. First operand 160172 states and 247801 transitions. Second operand 9 states. [2020-07-21 17:31:11,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:31:11,406 INFO L93 Difference]: Finished difference Result 946696 states and 1477597 transitions. [2020-07-21 17:31:11,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 17:31:11,406 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 326 [2020-07-21 17:31:11,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:31:12,947 INFO L225 Difference]: With dead ends: 946696 [2020-07-21 17:31:12,947 INFO L226 Difference]: Without dead ends: 883282 [2020-07-21 17:31:13,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 17:31:13,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 883282 states. [2020-07-21 17:32:00,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 883282 to 458214. [2020-07-21 17:32:00,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 458214 states. [2020-07-21 17:32:01,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458214 states to 458214 states and 714575 transitions. [2020-07-21 17:32:01,835 INFO L78 Accepts]: Start accepts. Automaton has 458214 states and 714575 transitions. Word has length 326 [2020-07-21 17:32:01,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:32:01,836 INFO L479 AbstractCegarLoop]: Abstraction has 458214 states and 714575 transitions. [2020-07-21 17:32:01,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 17:32:01,836 INFO L276 IsEmpty]: Start isEmpty. Operand 458214 states and 714575 transitions. [2020-07-21 17:32:01,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 17:32:01,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:32:01,969 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] [2020-07-21 17:32:02,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:32:02,170 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:32:02,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:32:02,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1819936301, now seen corresponding path program 1 times [2020-07-21 17:32:02,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:32:02,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392303845] [2020-07-21 17:32:02,172 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:32:02,525 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:32:02,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:32:02,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 2061 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:32:02,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:32:02,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:32:02,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:32:02,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392303845] [2020-07-21 17:32:02,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:32:02,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:32:02,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188206953] [2020-07-21 17:32:02,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:32:02,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:32:02,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:32:02,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:32:02,603 INFO L87 Difference]: Start difference. First operand 458214 states and 714575 transitions. Second operand 3 states. [2020-07-21 17:33:08,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:33:08,197 INFO L93 Difference]: Finished difference Result 1136217 states and 1782225 transitions. [2020-07-21 17:33:08,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:33:08,198 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 17:33:08,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:33:09,452 INFO L225 Difference]: With dead ends: 1136217 [2020-07-21 17:33:09,452 INFO L226 Difference]: Without dead ends: 680402 [2020-07-21 17:33:10,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:33:11,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680402 states. [2020-07-21 17:34:23,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680402 to 642592. [2020-07-21 17:34:23,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 642592 states. [2020-07-21 17:34:25,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642592 states to 642592 states and 1003023 transitions. [2020-07-21 17:34:25,533 INFO L78 Accepts]: Start accepts. Automaton has 642592 states and 1003023 transitions. Word has length 326 [2020-07-21 17:34:25,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:34:25,533 INFO L479 AbstractCegarLoop]: Abstraction has 642592 states and 1003023 transitions. [2020-07-21 17:34:25,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:34:25,533 INFO L276 IsEmpty]: Start isEmpty. Operand 642592 states and 1003023 transitions. [2020-07-21 17:34:25,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 17:34:25,662 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:34:25,662 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] [2020-07-21 17:34:25,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:25,863 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:34:25,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:34:25,864 INFO L82 PathProgramCache]: Analyzing trace with hash -242970601, now seen corresponding path program 1 times [2020-07-21 17:34:25,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:34:25,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169130782] [2020-07-21 17:34:25,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:34:26,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:34:26,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:34:26,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 1481 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 17:34:26,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:34:26,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:34:26,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:34:26,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169130782] [2020-07-21 17:34:26,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:34:26,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 17:34:26,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789207876] [2020-07-21 17:34:26,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 17:34:26,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:34:26,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 17:34:26,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 17:34:26,232 INFO L87 Difference]: Start difference. First operand 642592 states and 1003023 transitions. Second operand 4 states. [2020-07-21 17:35:30,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:35:30,402 INFO L93 Difference]: Finished difference Result 947902 states and 1478757 transitions. [2020-07-21 17:35:30,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 17:35:30,402 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-07-21 17:35:30,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:35:31,476 INFO L225 Difference]: With dead ends: 947902 [2020-07-21 17:35:31,476 INFO L226 Difference]: Without dead ends: 642629 [2020-07-21 17:35:31,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 17:35:32,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 642629 states. [2020-07-21 17:36:41,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 642629 to 641901. [2020-07-21 17:36:41,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 641901 states. [2020-07-21 17:36:43,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 641901 states to 641901 states and 1001966 transitions. [2020-07-21 17:36:43,219 INFO L78 Accepts]: Start accepts. Automaton has 641901 states and 1001966 transitions. Word has length 326 [2020-07-21 17:36:43,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:36:43,219 INFO L479 AbstractCegarLoop]: Abstraction has 641901 states and 1001966 transitions. [2020-07-21 17:36:43,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 17:36:43,220 INFO L276 IsEmpty]: Start isEmpty. Operand 641901 states and 1001966 transitions. [2020-07-21 17:36:43,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 17:36:43,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:36:43,340 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] [2020-07-21 17:36:43,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:43,541 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:36:43,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:36:43,542 INFO L82 PathProgramCache]: Analyzing trace with hash 163957912, now seen corresponding path program 1 times [2020-07-21 17:36:43,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:36:43,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960244658] [2020-07-21 17:36:43,543 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:36:43,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 17:36:43,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:36:43,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1483 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 17:36:43,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:36:44,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:36:44,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:36:44,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960244658] [2020-07-21 17:36:44,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:36:44,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:36:44,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288198549] [2020-07-21 17:36:44,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:36:44,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:36:44,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:36:44,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:36:44,839 INFO L87 Difference]: Start difference. First operand 641901 states and 1001966 transitions. Second operand 3 states.