/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 15:02:58,310 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 15:02:58,316 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 15:02:58,331 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 15:02:58,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 15:02:58,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 15:02:58,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 15:02:58,335 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 15:02:58,337 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 15:02:58,338 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 15:02:58,339 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 15:02:58,340 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 15:02:58,340 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 15:02:58,341 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 15:02:58,342 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 15:02:58,343 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 15:02:58,344 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 15:02:58,345 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 15:02:58,347 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 15:02:58,349 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 15:02:58,350 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 15:02:58,352 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 15:02:58,353 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 15:02:58,353 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 15:02:58,356 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 15:02:58,356 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 15:02:58,357 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 15:02:58,357 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 15:02:58,358 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 15:02:58,359 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 15:02:58,359 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 15:02:58,360 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 15:02:58,361 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 15:02:58,361 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 15:02:58,362 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 15:02:58,362 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 15:02:58,363 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 15:02:58,363 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 15:02:58,364 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 15:02:58,364 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 15:02:58,365 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 15:02:58,366 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 15:02:58,380 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 15:02:58,381 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 15:02:58,382 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 15:02:58,382 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 15:02:58,382 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 15:02:58,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 15:02:58,383 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 15:02:58,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 15:02:58,383 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 15:02:58,383 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 15:02:58,383 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 15:02:58,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 15:02:58,384 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 15:02:58,384 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 15:02:58,384 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 15:02:58,384 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 15:02:58,385 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 15:02:58,385 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 15:02:58,385 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 15:02:58,385 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 15:02:58,385 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 15:02:58,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:02:58,386 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 15:02:58,386 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 15:02:58,386 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 15:02:58,386 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 15:02:58,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:02:58,387 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 15:02:58,387 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 15:02:58,387 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_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 15:02:58,744 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 15:02:58,759 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 15:02:58,762 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 15:02:58,764 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 15:02:58,765 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 15:02:58,765 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:02:58,829 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b4a7057b/7b8a6be2385f4c6c80b6975d500b8d3e/FLAG478c96bc6 [2020-07-20 15:02:59,510 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 15:02:59,511 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:02:59,540 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b4a7057b/7b8a6be2385f4c6c80b6975d500b8d3e/FLAG478c96bc6 [2020-07-20 15:02:59,680 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1b4a7057b/7b8a6be2385f4c6c80b6975d500b8d3e [2020-07-20 15:02:59,690 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 15:02:59,694 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 15:02:59,695 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 15:02:59,695 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 15:02:59,700 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 15:02:59,701 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:02:59" (1/1) ... [2020-07-20 15:02:59,705 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d0f554d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:02:59, skipping insertion in model container [2020-07-20 15:02:59,705 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:02:59" (1/1) ... [2020-07-20 15:02:59,714 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 15:02:59,892 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 15:03:01,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:03:01,358 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 15:03:02,337 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:03:02,389 INFO L208 MainTranslator]: Completed translation [2020-07-20 15:03:02,396 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02 WrapperNode [2020-07-20 15:03:02,396 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 15:03:02,398 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 15:03:02,398 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 15:03:02,398 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 15:03:02,414 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,475 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,476 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,586 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,597 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... [2020-07-20 15:03:02,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 15:03:02,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 15:03:02,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 15:03:02,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 15:03:02,618 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:03:02,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 15:03:02,701 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 15:03:02,701 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 15:03:02,702 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 15:03:02,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 15:03:02,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 15:03:02,702 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 15:03:02,703 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 15:03:02,703 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 15:03:02,703 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 15:03:02,703 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 15:03:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 15:03:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 15:03:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 15:03:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 15:03:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 15:03:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 15:03:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 15:03:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 15:03:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 15:03:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 15:03:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 15:03:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 15:03:06,720 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 15:03:06,721 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 15:03:06,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:03:06 BoogieIcfgContainer [2020-07-20 15:03:06,733 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 15:03:06,735 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 15:03:06,735 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 15:03:06,738 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 15:03:06,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:02:59" (1/3) ... [2020-07-20 15:03:06,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf1e3ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:03:06, skipping insertion in model container [2020-07-20 15:03:06,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:03:02" (2/3) ... [2020-07-20 15:03:06,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf1e3ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:03:06, skipping insertion in model container [2020-07-20 15:03:06,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:03:06" (3/3) ... [2020-07-20 15:03:06,743 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:03:06,754 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 15:03:06,764 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 15:03:06,778 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 15:03:06,813 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 15:03:06,814 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 15:03:06,814 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 15:03:06,814 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 15:03:06,814 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 15:03:06,814 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 15:03:06,815 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 15:03:06,815 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 15:03:06,859 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states. [2020-07-20 15:03:06,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 15:03:06,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:06,909 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:06,909 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:06,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:06,916 INFO L82 PathProgramCache]: Analyzing trace with hash -866812329, now seen corresponding path program 1 times [2020-07-20 15:03:06,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:06,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1983309980] [2020-07-20 15:03:06,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:07,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:07,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:07,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 1573 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:03:07,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:07,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:07,887 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:07,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1983309980] [2020-07-20 15:03:07,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:07,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:03:07,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026735935] [2020-07-20 15:03:07,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:03:07,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:07,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:03:07,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:03:07,909 INFO L87 Difference]: Start difference. First operand 1340 states. Second operand 4 states. [2020-07-20 15:03:08,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:08,363 INFO L93 Difference]: Finished difference Result 3967 states and 7151 transitions. [2020-07-20 15:03:08,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 15:03:08,365 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 476 [2020-07-20 15:03:08,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:08,400 INFO L225 Difference]: With dead ends: 3967 [2020-07-20 15:03:08,400 INFO L226 Difference]: Without dead ends: 2636 [2020-07-20 15:03:08,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:03:08,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2020-07-20 15:03:08,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 2634. [2020-07-20 15:03:08,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2634 states. [2020-07-20 15:03:08,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2634 states to 2634 states and 4315 transitions. [2020-07-20 15:03:08,599 INFO L78 Accepts]: Start accepts. Automaton has 2634 states and 4315 transitions. Word has length 476 [2020-07-20 15:03:08,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:08,602 INFO L479 AbstractCegarLoop]: Abstraction has 2634 states and 4315 transitions. [2020-07-20 15:03:08,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:03:08,602 INFO L276 IsEmpty]: Start isEmpty. Operand 2634 states and 4315 transitions. [2020-07-20 15:03:08,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 15:03:08,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:08,620 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:08,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:08,854 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:08,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:08,855 INFO L82 PathProgramCache]: Analyzing trace with hash 47179568, now seen corresponding path program 1 times [2020-07-20 15:03:08,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:08,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095156047] [2020-07-20 15:03:08,856 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:09,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:03:09,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:09,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 1786 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 15:03:09,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:09,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:09,679 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:09,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095156047] [2020-07-20 15:03:09,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:09,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:09,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038348338] [2020-07-20 15:03:09,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:09,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:09,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:09,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:09,683 INFO L87 Difference]: Start difference. First operand 2634 states and 4315 transitions. Second operand 3 states. [2020-07-20 15:03:09,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:09,970 INFO L93 Difference]: Finished difference Result 3529 states and 5822 transitions. [2020-07-20 15:03:09,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:09,971 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 15:03:09,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:09,991 INFO L225 Difference]: With dead ends: 3529 [2020-07-20 15:03:09,991 INFO L226 Difference]: Without dead ends: 3134 [2020-07-20 15:03:09,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:10,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3134 states. [2020-07-20 15:03:10,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3134 to 3132. [2020-07-20 15:03:10,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3132 states. [2020-07-20 15:03:10,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3132 states to 3132 states and 5144 transitions. [2020-07-20 15:03:10,137 INFO L78 Accepts]: Start accepts. Automaton has 3132 states and 5144 transitions. Word has length 478 [2020-07-20 15:03:10,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:10,139 INFO L479 AbstractCegarLoop]: Abstraction has 3132 states and 5144 transitions. [2020-07-20 15:03:10,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:10,139 INFO L276 IsEmpty]: Start isEmpty. Operand 3132 states and 5144 transitions. [2020-07-20 15:03:10,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 15:03:10,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:10,156 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:10,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:10,371 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:10,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:10,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1082038238, now seen corresponding path program 1 times [2020-07-20 15:03:10,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:10,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627301007] [2020-07-20 15:03:10,374 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:11,020 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:03:11,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:11,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 1787 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:11,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:11,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:11,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:11,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627301007] [2020-07-20 15:03:11,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:11,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:11,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255379423] [2020-07-20 15:03:11,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:11,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:11,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:11,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:11,309 INFO L87 Difference]: Start difference. First operand 3132 states and 5144 transitions. Second operand 3 states. [2020-07-20 15:03:11,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:11,727 INFO L93 Difference]: Finished difference Result 9114 states and 14933 transitions. [2020-07-20 15:03:11,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:11,727 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 15:03:11,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:11,759 INFO L225 Difference]: With dead ends: 9114 [2020-07-20 15:03:11,759 INFO L226 Difference]: Without dead ends: 6196 [2020-07-20 15:03:11,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:11,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6196 states. [2020-07-20 15:03:12,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6196 to 6194. [2020-07-20 15:03:12,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6194 states. [2020-07-20 15:03:12,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6194 states to 6194 states and 10141 transitions. [2020-07-20 15:03:12,064 INFO L78 Accepts]: Start accepts. Automaton has 6194 states and 10141 transitions. Word has length 478 [2020-07-20 15:03:12,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:12,065 INFO L479 AbstractCegarLoop]: Abstraction has 6194 states and 10141 transitions. [2020-07-20 15:03:12,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:12,065 INFO L276 IsEmpty]: Start isEmpty. Operand 6194 states and 10141 transitions. [2020-07-20 15:03:12,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 15:03:12,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:12,084 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:12,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:12,299 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:12,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:12,299 INFO L82 PathProgramCache]: Analyzing trace with hash -2101540850, now seen corresponding path program 1 times [2020-07-20 15:03:12,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:12,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295100575] [2020-07-20 15:03:12,300 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:12,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:12,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:12,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 1577 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:12,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:12,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:12,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:12,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295100575] [2020-07-20 15:03:12,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:12,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:12,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293283850] [2020-07-20 15:03:12,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:12,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:12,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:12,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:12,877 INFO L87 Difference]: Start difference. First operand 6194 states and 10141 transitions. Second operand 3 states. [2020-07-20 15:03:13,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:13,259 INFO L93 Difference]: Finished difference Result 18485 states and 30255 transitions. [2020-07-20 15:03:13,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:13,260 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-20 15:03:13,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:13,321 INFO L225 Difference]: With dead ends: 18485 [2020-07-20 15:03:13,322 INFO L226 Difference]: Without dead ends: 12343 [2020-07-20 15:03:13,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:13,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12343 states. [2020-07-20 15:03:13,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12343 to 6241. [2020-07-20 15:03:13,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6241 states. [2020-07-20 15:03:13,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6241 states to 6241 states and 10215 transitions. [2020-07-20 15:03:13,693 INFO L78 Accepts]: Start accepts. Automaton has 6241 states and 10215 transitions. Word has length 479 [2020-07-20 15:03:13,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:13,694 INFO L479 AbstractCegarLoop]: Abstraction has 6241 states and 10215 transitions. [2020-07-20 15:03:13,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:13,694 INFO L276 IsEmpty]: Start isEmpty. Operand 6241 states and 10215 transitions. [2020-07-20 15:03:13,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 481 [2020-07-20 15:03:13,716 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:13,717 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:13,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:13,931 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:13,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:13,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1016409383, now seen corresponding path program 1 times [2020-07-20 15:03:13,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:13,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154255053] [2020-07-20 15:03:13,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:14,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:14,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:14,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 1577 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:03:14,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:14,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:14,544 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:14,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154255053] [2020-07-20 15:03:14,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:14,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:03:14,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703012205] [2020-07-20 15:03:14,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:03:14,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:14,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:03:14,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:03:14,546 INFO L87 Difference]: Start difference. First operand 6241 states and 10215 transitions. Second operand 4 states. [2020-07-20 15:03:15,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:15,157 INFO L93 Difference]: Finished difference Result 14360 states and 23638 transitions. [2020-07-20 15:03:15,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:03:15,157 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 480 [2020-07-20 15:03:15,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:15,190 INFO L225 Difference]: With dead ends: 14360 [2020-07-20 15:03:15,193 INFO L226 Difference]: Without dead ends: 7384 [2020-07-20 15:03:15,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:03:15,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7384 states. [2020-07-20 15:03:15,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7384 to 7382. [2020-07-20 15:03:15,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7382 states. [2020-07-20 15:03:15,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7382 states to 7382 states and 12137 transitions. [2020-07-20 15:03:15,501 INFO L78 Accepts]: Start accepts. Automaton has 7382 states and 12137 transitions. Word has length 480 [2020-07-20 15:03:15,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:15,501 INFO L479 AbstractCegarLoop]: Abstraction has 7382 states and 12137 transitions. [2020-07-20 15:03:15,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:03:15,501 INFO L276 IsEmpty]: Start isEmpty. Operand 7382 states and 12137 transitions. [2020-07-20 15:03:15,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 15:03:15,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:15,520 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:15,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:15,734 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:15,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:15,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1586761466, now seen corresponding path program 1 times [2020-07-20 15:03:15,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:15,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139734419] [2020-07-20 15:03:15,736 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:16,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:03:16,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:16,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 1792 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:16,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:16,480 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:16,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:16,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139734419] [2020-07-20 15:03:16,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:16,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:16,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570440789] [2020-07-20 15:03:16,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:16,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:16,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:16,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:16,483 INFO L87 Difference]: Start difference. First operand 7382 states and 12137 transitions. Second operand 3 states. [2020-07-20 15:03:17,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:17,135 INFO L93 Difference]: Finished difference Result 21091 states and 34542 transitions. [2020-07-20 15:03:17,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:17,135 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 482 [2020-07-20 15:03:17,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:17,170 INFO L225 Difference]: With dead ends: 21091 [2020-07-20 15:03:17,171 INFO L226 Difference]: Without dead ends: 14417 [2020-07-20 15:03:17,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:17,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14417 states. [2020-07-20 15:03:17,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14417 to 14415. [2020-07-20 15:03:17,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14415 states. [2020-07-20 15:03:17,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14415 states to 14415 states and 23589 transitions. [2020-07-20 15:03:17,667 INFO L78 Accepts]: Start accepts. Automaton has 14415 states and 23589 transitions. Word has length 482 [2020-07-20 15:03:17,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:17,667 INFO L479 AbstractCegarLoop]: Abstraction has 14415 states and 23589 transitions. [2020-07-20 15:03:17,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:17,667 INFO L276 IsEmpty]: Start isEmpty. Operand 14415 states and 23589 transitions. [2020-07-20 15:03:17,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 15:03:17,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:17,695 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:17,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:17,910 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:17,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:17,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1235675745, now seen corresponding path program 1 times [2020-07-20 15:03:17,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:17,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259031672] [2020-07-20 15:03:17,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:18,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:03:18,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:18,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 1398 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:18,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:18,992 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:18,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:18,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259031672] [2020-07-20 15:03:18,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:18,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:18,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118023169] [2020-07-20 15:03:18,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:18,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:18,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:18,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:18,995 INFO L87 Difference]: Start difference. First operand 14415 states and 23589 transitions. Second operand 3 states. [2020-07-20 15:03:19,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:19,507 INFO L93 Difference]: Finished difference Result 42892 states and 70139 transitions. [2020-07-20 15:03:19,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:19,508 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 482 [2020-07-20 15:03:19,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:19,585 INFO L225 Difference]: With dead ends: 42892 [2020-07-20 15:03:19,585 INFO L226 Difference]: Without dead ends: 28656 [2020-07-20 15:03:19,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:19,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28656 states. [2020-07-20 15:03:20,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28656 to 14534. [2020-07-20 15:03:20,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14534 states. [2020-07-20 15:03:20,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14534 states to 14534 states and 23748 transitions. [2020-07-20 15:03:20,389 INFO L78 Accepts]: Start accepts. Automaton has 14534 states and 23748 transitions. Word has length 482 [2020-07-20 15:03:20,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:20,389 INFO L479 AbstractCegarLoop]: Abstraction has 14534 states and 23748 transitions. [2020-07-20 15:03:20,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:20,390 INFO L276 IsEmpty]: Start isEmpty. Operand 14534 states and 23748 transitions. [2020-07-20 15:03:20,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 15:03:20,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:20,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:20,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:20,621 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:20,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:20,622 INFO L82 PathProgramCache]: Analyzing trace with hash 2045457908, now seen corresponding path program 1 times [2020-07-20 15:03:20,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:20,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019633715] [2020-07-20 15:03:20,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:20,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:20,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:20,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 1581 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:20,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:21,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:21,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:21,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019633715] [2020-07-20 15:03:21,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:21,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:21,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679997844] [2020-07-20 15:03:21,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:21,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:21,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:21,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:21,142 INFO L87 Difference]: Start difference. First operand 14534 states and 23748 transitions. Second operand 3 states. [2020-07-20 15:03:22,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:22,417 INFO L93 Difference]: Finished difference Result 43144 states and 70488 transitions. [2020-07-20 15:03:22,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:22,417 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-20 15:03:22,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:22,478 INFO L225 Difference]: With dead ends: 43144 [2020-07-20 15:03:22,479 INFO L226 Difference]: Without dead ends: 28859 [2020-07-20 15:03:22,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:22,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28859 states. [2020-07-20 15:03:23,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28859 to 14737. [2020-07-20 15:03:23,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14737 states. [2020-07-20 15:03:23,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14737 states to 14737 states and 24030 transitions. [2020-07-20 15:03:23,194 INFO L78 Accepts]: Start accepts. Automaton has 14737 states and 24030 transitions. Word has length 483 [2020-07-20 15:03:23,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:23,195 INFO L479 AbstractCegarLoop]: Abstraction has 14737 states and 24030 transitions. [2020-07-20 15:03:23,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:23,195 INFO L276 IsEmpty]: Start isEmpty. Operand 14737 states and 24030 transitions. [2020-07-20 15:03:23,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-20 15:03:23,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:23,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:23,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:23,418 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:23,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:23,419 INFO L82 PathProgramCache]: Analyzing trace with hash 103152971, now seen corresponding path program 1 times [2020-07-20 15:03:23,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:23,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217994451] [2020-07-20 15:03:23,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:23,791 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:23,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:23,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 1580 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:03:23,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:24,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:24,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:24,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217994451] [2020-07-20 15:03:24,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:24,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:03:24,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484974602] [2020-07-20 15:03:24,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:03:24,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:24,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:03:24,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:03:24,075 INFO L87 Difference]: Start difference. First operand 14737 states and 24030 transitions. Second operand 4 states. [2020-07-20 15:03:24,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:24,746 INFO L93 Difference]: Finished difference Result 34526 states and 56613 transitions. [2020-07-20 15:03:24,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:03:24,746 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 484 [2020-07-20 15:03:24,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:24,775 INFO L225 Difference]: With dead ends: 34526 [2020-07-20 15:03:24,775 INFO L226 Difference]: Without dead ends: 18042 [2020-07-20 15:03:24,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:03:24,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18042 states. [2020-07-20 15:03:26,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18042 to 18040. [2020-07-20 15:03:26,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18040 states. [2020-07-20 15:03:26,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18040 states to 18040 states and 29508 transitions. [2020-07-20 15:03:26,142 INFO L78 Accepts]: Start accepts. Automaton has 18040 states and 29508 transitions. Word has length 484 [2020-07-20 15:03:26,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:26,143 INFO L479 AbstractCegarLoop]: Abstraction has 18040 states and 29508 transitions. [2020-07-20 15:03:26,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:03:26,143 INFO L276 IsEmpty]: Start isEmpty. Operand 18040 states and 29508 transitions. [2020-07-20 15:03:26,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 15:03:26,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:26,162 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:26,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:26,365 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:26,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:26,366 INFO L82 PathProgramCache]: Analyzing trace with hash -645989766, now seen corresponding path program 1 times [2020-07-20 15:03:26,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:26,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642242357] [2020-07-20 15:03:26,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:26,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:03:26,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:26,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 1398 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:26,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:26,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:26,837 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:26,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642242357] [2020-07-20 15:03:26,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:26,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:26,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467764399] [2020-07-20 15:03:26,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:26,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:26,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:26,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:26,840 INFO L87 Difference]: Start difference. First operand 18040 states and 29508 transitions. Second operand 3 states. [2020-07-20 15:03:27,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:27,826 INFO L93 Difference]: Finished difference Result 50472 states and 82347 transitions. [2020-07-20 15:03:27,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:27,827 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-20 15:03:27,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:27,868 INFO L225 Difference]: With dead ends: 50472 [2020-07-20 15:03:27,868 INFO L226 Difference]: Without dead ends: 34266 [2020-07-20 15:03:27,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:27,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34266 states. [2020-07-20 15:03:28,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34266 to 18240. [2020-07-20 15:03:28,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18240 states. [2020-07-20 15:03:28,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18240 states to 18240 states and 29795 transitions. [2020-07-20 15:03:28,550 INFO L78 Accepts]: Start accepts. Automaton has 18240 states and 29795 transitions. Word has length 487 [2020-07-20 15:03:28,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:28,551 INFO L479 AbstractCegarLoop]: Abstraction has 18240 states and 29795 transitions. [2020-07-20 15:03:28,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:28,551 INFO L276 IsEmpty]: Start isEmpty. Operand 18240 states and 29795 transitions. [2020-07-20 15:03:28,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 15:03:28,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:28,574 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:28,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:28,788 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:28,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:28,789 INFO L82 PathProgramCache]: Analyzing trace with hash -959203455, now seen corresponding path program 1 times [2020-07-20 15:03:28,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:28,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517847973] [2020-07-20 15:03:28,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:29,124 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:03:29,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:29,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 1398 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:29,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:29,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:29,230 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:29,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517847973] [2020-07-20 15:03:29,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:29,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:29,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428976411] [2020-07-20 15:03:29,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:29,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:29,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:29,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:29,232 INFO L87 Difference]: Start difference. First operand 18240 states and 29795 transitions. Second operand 3 states. [2020-07-20 15:03:30,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:30,270 INFO L93 Difference]: Finished difference Result 51888 states and 84640 transitions. [2020-07-20 15:03:30,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:30,271 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-20 15:03:30,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:30,312 INFO L225 Difference]: With dead ends: 51888 [2020-07-20 15:03:30,312 INFO L226 Difference]: Without dead ends: 35072 [2020-07-20 15:03:30,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:30,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35072 states. [2020-07-20 15:03:31,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35072 to 18418. [2020-07-20 15:03:31,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18418 states. [2020-07-20 15:03:31,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18418 states to 18418 states and 30052 transitions. [2020-07-20 15:03:31,305 INFO L78 Accepts]: Start accepts. Automaton has 18418 states and 30052 transitions. Word has length 487 [2020-07-20 15:03:31,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:31,306 INFO L479 AbstractCegarLoop]: Abstraction has 18418 states and 30052 transitions. [2020-07-20 15:03:31,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:31,306 INFO L276 IsEmpty]: Start isEmpty. Operand 18418 states and 30052 transitions. [2020-07-20 15:03:31,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 15:03:31,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:31,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:31,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:31,540 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:31,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:31,541 INFO L82 PathProgramCache]: Analyzing trace with hash -509137109, now seen corresponding path program 1 times [2020-07-20 15:03:31,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:31,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139975271] [2020-07-20 15:03:31,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:31,930 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:31,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:31,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 1600 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 15:03:31,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:32,050 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,095 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,123 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,267 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,327 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,375 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,378 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,380 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:32,382 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 15:03:33,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:33,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:33,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139975271] [2020-07-20 15:03:33,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:33,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-20 15:03:33,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302838034] [2020-07-20 15:03:33,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 15:03:33,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:33,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 15:03:33,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 15:03:33,097 INFO L87 Difference]: Start difference. First operand 18418 states and 30052 transitions. Second operand 12 states. [2020-07-20 15:03:38,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:38,691 INFO L93 Difference]: Finished difference Result 35539 states and 56881 transitions. [2020-07-20 15:03:38,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 15:03:38,691 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 488 [2020-07-20 15:03:38,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:38,733 INFO L225 Difference]: With dead ends: 35539 [2020-07-20 15:03:38,734 INFO L226 Difference]: Without dead ends: 32805 [2020-07-20 15:03:38,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 476 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=157, Invalid=443, Unknown=0, NotChecked=0, Total=600 [2020-07-20 15:03:38,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32805 states. [2020-07-20 15:03:39,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32805 to 19992. [2020-07-20 15:03:39,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19992 states. [2020-07-20 15:03:39,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19992 states to 19992 states and 32379 transitions. [2020-07-20 15:03:39,821 INFO L78 Accepts]: Start accepts. Automaton has 19992 states and 32379 transitions. Word has length 488 [2020-07-20 15:03:39,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:39,822 INFO L479 AbstractCegarLoop]: Abstraction has 19992 states and 32379 transitions. [2020-07-20 15:03:39,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 15:03:39,822 INFO L276 IsEmpty]: Start isEmpty. Operand 19992 states and 32379 transitions. [2020-07-20 15:03:39,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 15:03:39,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:39,846 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:40,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:40,061 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:40,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:40,062 INFO L82 PathProgramCache]: Analyzing trace with hash 404011213, now seen corresponding path program 1 times [2020-07-20 15:03:40,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:40,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100495938] [2020-07-20 15:03:40,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:40,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:03:40,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:40,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 1809 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:03:40,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:40,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:40,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:40,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100495938] [2020-07-20 15:03:40,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:40,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:03:40,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61728816] [2020-07-20 15:03:40,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:03:40,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:40,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:03:40,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:03:40,726 INFO L87 Difference]: Start difference. First operand 19992 states and 32379 transitions. Second operand 4 states. [2020-07-20 15:03:42,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:42,623 INFO L93 Difference]: Finished difference Result 57185 states and 92604 transitions. [2020-07-20 15:03:42,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:03:42,623 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 488 [2020-07-20 15:03:42,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:42,677 INFO L225 Difference]: With dead ends: 57185 [2020-07-20 15:03:42,678 INFO L226 Difference]: Without dead ends: 38078 [2020-07-20 15:03:42,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:03:42,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38078 states. [2020-07-20 15:03:44,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38078 to 38076. [2020-07-20 15:03:44,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38076 states. [2020-07-20 15:03:44,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38076 states to 38076 states and 61385 transitions. [2020-07-20 15:03:44,705 INFO L78 Accepts]: Start accepts. Automaton has 38076 states and 61385 transitions. Word has length 488 [2020-07-20 15:03:44,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:44,705 INFO L479 AbstractCegarLoop]: Abstraction has 38076 states and 61385 transitions. [2020-07-20 15:03:44,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:03:44,705 INFO L276 IsEmpty]: Start isEmpty. Operand 38076 states and 61385 transitions. [2020-07-20 15:03:44,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 15:03:44,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:44,748 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:44,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:44,962 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:44,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:44,963 INFO L82 PathProgramCache]: Analyzing trace with hash 14643502, now seen corresponding path program 1 times [2020-07-20 15:03:44,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:44,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112596933] [2020-07-20 15:03:44,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:45,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:45,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:45,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 1583 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:45,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:45,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:45,490 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:45,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112596933] [2020-07-20 15:03:45,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:45,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:45,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588678347] [2020-07-20 15:03:45,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:45,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:45,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:45,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:45,493 INFO L87 Difference]: Start difference. First operand 38076 states and 61385 transitions. Second operand 3 states. [2020-07-20 15:03:49,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:49,580 INFO L93 Difference]: Finished difference Result 108907 states and 175300 transitions. [2020-07-20 15:03:49,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:49,580 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 488 [2020-07-20 15:03:49,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:49,699 INFO L225 Difference]: With dead ends: 108907 [2020-07-20 15:03:49,699 INFO L226 Difference]: Without dead ends: 73499 [2020-07-20 15:03:49,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 486 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:49,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73499 states. [2020-07-20 15:03:52,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73499 to 38529. [2020-07-20 15:03:52,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38529 states. [2020-07-20 15:03:52,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38529 states to 38529 states and 61994 transitions. [2020-07-20 15:03:52,073 INFO L78 Accepts]: Start accepts. Automaton has 38529 states and 61994 transitions. Word has length 488 [2020-07-20 15:03:52,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:52,073 INFO L479 AbstractCegarLoop]: Abstraction has 38529 states and 61994 transitions. [2020-07-20 15:03:52,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:52,073 INFO L276 IsEmpty]: Start isEmpty. Operand 38529 states and 61994 transitions. [2020-07-20 15:03:52,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 15:03:52,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:52,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:52,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:52,306 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:52,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:52,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1665949070, now seen corresponding path program 1 times [2020-07-20 15:03:52,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:52,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87143392] [2020-07-20 15:03:52,307 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:52,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:03:52,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:52,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 1797 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:52,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:52,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:52,942 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:52,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87143392] [2020-07-20 15:03:52,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:52,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:52,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340466185] [2020-07-20 15:03:52,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:52,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:52,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:52,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:52,944 INFO L87 Difference]: Start difference. First operand 38529 states and 61994 transitions. Second operand 3 states. [2020-07-20 15:03:57,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:57,995 INFO L93 Difference]: Finished difference Result 109786 states and 176341 transitions. [2020-07-20 15:03:57,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:57,996 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 488 [2020-07-20 15:03:57,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:58,105 INFO L225 Difference]: With dead ends: 109786 [2020-07-20 15:03:58,106 INFO L226 Difference]: Without dead ends: 75206 [2020-07-20 15:03:58,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 486 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:58,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75206 states. [2020-07-20 15:04:02,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75206 to 75204. [2020-07-20 15:04:02,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75204 states. [2020-07-20 15:04:02,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75204 states to 75204 states and 120522 transitions. [2020-07-20 15:04:02,692 INFO L78 Accepts]: Start accepts. Automaton has 75204 states and 120522 transitions. Word has length 488 [2020-07-20 15:04:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:04:02,693 INFO L479 AbstractCegarLoop]: Abstraction has 75204 states and 120522 transitions. [2020-07-20 15:04:02,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:04:02,693 INFO L276 IsEmpty]: Start isEmpty. Operand 75204 states and 120522 transitions. [2020-07-20 15:04:02,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 15:04:02,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:04:02,752 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:04:02,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:02,953 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:04:02,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:04:02,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1305704341, now seen corresponding path program 1 times [2020-07-20 15:04:02,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:04:02,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52492436] [2020-07-20 15:04:02,955 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:03,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:04:03,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:04:03,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 1398 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:04:03,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:04:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:04:03,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:04:03,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52492436] [2020-07-20 15:04:03,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:04:03,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:04:03,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290259389] [2020-07-20 15:04:03,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:04:03,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:04:03,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:04:03,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:04:03,455 INFO L87 Difference]: Start difference. First operand 75204 states and 120522 transitions. Second operand 4 states. [2020-07-20 15:04:14,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:04:14,169 INFO L93 Difference]: Finished difference Result 203765 states and 325299 transitions. [2020-07-20 15:04:14,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:04:14,169 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 488 [2020-07-20 15:04:14,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:04:14,352 INFO L225 Difference]: With dead ends: 203765 [2020-07-20 15:04:14,352 INFO L226 Difference]: Without dead ends: 137555 [2020-07-20 15:04:14,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:04:14,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137555 states. [2020-07-20 15:04:19,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137555 to 79371. [2020-07-20 15:04:19,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79371 states. [2020-07-20 15:04:19,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79371 states to 79371 states and 127312 transitions. [2020-07-20 15:04:19,531 INFO L78 Accepts]: Start accepts. Automaton has 79371 states and 127312 transitions. Word has length 488 [2020-07-20 15:04:19,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:04:19,532 INFO L479 AbstractCegarLoop]: Abstraction has 79371 states and 127312 transitions. [2020-07-20 15:04:19,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:04:19,532 INFO L276 IsEmpty]: Start isEmpty. Operand 79371 states and 127312 transitions. [2020-07-20 15:04:19,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 15:04:19,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:04:19,619 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:04:19,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:19,833 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:04:19,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:04:19,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1492289198, now seen corresponding path program 1 times [2020-07-20 15:04:19,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:04:19,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868119956] [2020-07-20 15:04:19,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:20,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:04:20,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:04:20,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 1814 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:04:20,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:04:20,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:04:20,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:04:20,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868119956] [2020-07-20 15:04:20,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:04:20,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:04:20,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810363680] [2020-07-20 15:04:20,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:04:20,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:04:20,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:04:20,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:04:20,455 INFO L87 Difference]: Start difference. First operand 79371 states and 127312 transitions. Second operand 3 states. [2020-07-20 15:04:30,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:04:30,090 INFO L93 Difference]: Finished difference Result 224083 states and 359263 transitions. [2020-07-20 15:04:30,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:04:30,091 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 15:04:30,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:04:30,310 INFO L225 Difference]: With dead ends: 224083 [2020-07-20 15:04:30,311 INFO L226 Difference]: Without dead ends: 153359 [2020-07-20 15:04:30,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:04:30,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153359 states. [2020-07-20 15:04:42,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153359 to 153357. [2020-07-20 15:04:42,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153357 states. [2020-07-20 15:04:42,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153357 states to 153357 states and 244905 transitions. [2020-07-20 15:04:42,292 INFO L78 Accepts]: Start accepts. Automaton has 153357 states and 244905 transitions. Word has length 490 [2020-07-20 15:04:42,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:04:42,293 INFO L479 AbstractCegarLoop]: Abstraction has 153357 states and 244905 transitions. [2020-07-20 15:04:42,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:04:42,293 INFO L276 IsEmpty]: Start isEmpty. Operand 153357 states and 244905 transitions. [2020-07-20 15:04:42,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 15:04:42,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:04:42,422 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:04:42,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:42,633 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:04:42,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:04:42,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1503793535, now seen corresponding path program 1 times [2020-07-20 15:04:42,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:04:42,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839353041] [2020-07-20 15:04:42,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:42,959 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:04:42,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:04:42,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:04:42,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:04:43,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:04:43,069 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:04:43,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839353041] [2020-07-20 15:04:43,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:04:43,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:04:43,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619593302] [2020-07-20 15:04:43,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:04:43,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:04:43,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:04:43,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:04:43,071 INFO L87 Difference]: Start difference. First operand 153357 states and 244905 transitions. Second operand 3 states. [2020-07-20 15:05:02,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:05:02,018 INFO L93 Difference]: Finished difference Result 417229 states and 663413 transitions. [2020-07-20 15:05:02,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:05:02,019 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 491 [2020-07-20 15:05:02,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:05:02,375 INFO L225 Difference]: With dead ends: 417229 [2020-07-20 15:05:02,375 INFO L226 Difference]: Without dead ends: 285415 [2020-07-20 15:05:02,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:05:02,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285415 states. [2020-07-20 15:05:16,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285415 to 156997. [2020-07-20 15:05:16,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156997 states. [2020-07-20 15:05:17,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156997 states to 156997 states and 250407 transitions. [2020-07-20 15:05:17,114 INFO L78 Accepts]: Start accepts. Automaton has 156997 states and 250407 transitions. Word has length 491 [2020-07-20 15:05:17,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:05:17,115 INFO L479 AbstractCegarLoop]: Abstraction has 156997 states and 250407 transitions. [2020-07-20 15:05:17,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:05:17,115 INFO L276 IsEmpty]: Start isEmpty. Operand 156997 states and 250407 transitions. [2020-07-20 15:05:17,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-20 15:05:17,256 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:05:17,257 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:05:17,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:17,471 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:05:17,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:05:17,472 INFO L82 PathProgramCache]: Analyzing trace with hash 1996478217, now seen corresponding path program 1 times [2020-07-20 15:05:17,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:05:17,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658519586] [2020-07-20 15:05:17,473 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:17,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:05:17,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:05:17,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 1601 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:05:17,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:05:18,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:05:18,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:05:18,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658519586] [2020-07-20 15:05:18,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:05:18,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:05:18,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600293103] [2020-07-20 15:05:18,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:05:18,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:05:18,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:05:18,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:05:18,033 INFO L87 Difference]: Start difference. First operand 156997 states and 250407 transitions. Second operand 4 states. [2020-07-20 15:05:31,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:05:31,840 INFO L93 Difference]: Finished difference Result 374909 states and 601426 transitions. [2020-07-20 15:05:31,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:05:31,841 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 492 [2020-07-20 15:05:31,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:05:32,089 INFO L225 Difference]: With dead ends: 374909 [2020-07-20 15:05:32,089 INFO L226 Difference]: Without dead ends: 196736 [2020-07-20 15:05:32,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:05:32,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196736 states. [2020-07-20 15:05:49,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196736 to 196734. [2020-07-20 15:05:49,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196734 states. [2020-07-20 15:05:49,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196734 states to 196734 states and 315138 transitions. [2020-07-20 15:05:49,397 INFO L78 Accepts]: Start accepts. Automaton has 196734 states and 315138 transitions. Word has length 492 [2020-07-20 15:05:49,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:05:49,398 INFO L479 AbstractCegarLoop]: Abstraction has 196734 states and 315138 transitions. [2020-07-20 15:05:49,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:05:49,398 INFO L276 IsEmpty]: Start isEmpty. Operand 196734 states and 315138 transitions. [2020-07-20 15:05:49,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-20 15:05:49,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:05:49,584 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:05:49,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:49,789 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:05:49,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:05:49,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1992250301, now seen corresponding path program 1 times [2020-07-20 15:05:49,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:05:49,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709189159] [2020-07-20 15:05:49,791 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:05:50,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:05:50,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:05:50,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:05:50,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:05:50,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:05:50,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:05:50,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709189159] [2020-07-20 15:05:50,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:05:50,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:05:50,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164420928] [2020-07-20 15:05:50,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:05:50,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:05:50,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:05:50,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:05:50,710 INFO L87 Difference]: Start difference. First operand 196734 states and 315138 transitions. Second operand 4 states. [2020-07-20 15:06:12,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:06:12,510 INFO L93 Difference]: Finished difference Result 491702 states and 791656 transitions. [2020-07-20 15:06:12,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:06:12,511 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 492 [2020-07-20 15:06:12,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:06:12,834 INFO L225 Difference]: With dead ends: 491702 [2020-07-20 15:06:12,835 INFO L226 Difference]: Without dead ends: 254308 [2020-07-20 15:06:12,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:06:13,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254308 states. [2020-07-20 15:06:35,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254308 to 254306. [2020-07-20 15:06:35,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254306 states. [2020-07-20 15:06:35,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254306 states to 254306 states and 407146 transitions. [2020-07-20 15:06:35,674 INFO L78 Accepts]: Start accepts. Automaton has 254306 states and 407146 transitions. Word has length 492 [2020-07-20 15:06:35,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:06:35,674 INFO L479 AbstractCegarLoop]: Abstraction has 254306 states and 407146 transitions. [2020-07-20 15:06:35,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:06:35,674 INFO L276 IsEmpty]: Start isEmpty. Operand 254306 states and 407146 transitions. [2020-07-20 15:06:35,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-20 15:06:35,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:06:35,917 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:06:36,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:06:36,118 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:06:36,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:06:36,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1652741023, now seen corresponding path program 1 times [2020-07-20 15:06:36,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:06:36,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810777896] [2020-07-20 15:06:36,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:06:36,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:06:36,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:06:36,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 1407 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:06:36,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:06:36,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:06:36,576 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:06:36,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810777896] [2020-07-20 15:06:36,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:06:36,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:06:36,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710314886] [2020-07-20 15:06:36,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:06:36,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:06:36,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:06:36,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:06:36,578 INFO L87 Difference]: Start difference. First operand 254306 states and 407146 transitions. Second operand 4 states. [2020-07-20 15:07:11,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:11,442 INFO L93 Difference]: Finished difference Result 697386 states and 1114165 transitions. [2020-07-20 15:07:11,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:07:11,443 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 492 [2020-07-20 15:07:11,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:12,064 INFO L225 Difference]: With dead ends: 697386 [2020-07-20 15:07:12,065 INFO L226 Difference]: Without dead ends: 481048 [2020-07-20 15:07:12,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:07:12,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481048 states. [2020-07-20 15:07:42,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481048 to 286836. [2020-07-20 15:07:42,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286836 states. [2020-07-20 15:07:42,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286836 states to 286836 states and 457156 transitions. [2020-07-20 15:07:42,458 INFO L78 Accepts]: Start accepts. Automaton has 286836 states and 457156 transitions. Word has length 492 [2020-07-20 15:07:42,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:42,458 INFO L479 AbstractCegarLoop]: Abstraction has 286836 states and 457156 transitions. [2020-07-20 15:07:42,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:42,458 INFO L276 IsEmpty]: Start isEmpty. Operand 286836 states and 457156 transitions. [2020-07-20 15:07:42,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2020-07-20 15:07:42,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:42,773 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:07:42,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:42,979 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:42,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:42,980 INFO L82 PathProgramCache]: Analyzing trace with hash -247374860, now seen corresponding path program 1 times [2020-07-20 15:07:42,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:42,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226743563] [2020-07-20 15:07:42,981 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:43,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:07:43,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:43,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 1815 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:07:43,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:44,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:07:44,089 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:44,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226743563] [2020-07-20 15:07:44,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:44,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:07:44,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209060455] [2020-07-20 15:07:44,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:07:44,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:44,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:07:44,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:07:44,091 INFO L87 Difference]: Start difference. First operand 286836 states and 457156 transitions. Second operand 3 states. [2020-07-20 15:08:24,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:24,574 INFO L93 Difference]: Finished difference Result 765567 states and 1220176 transitions. [2020-07-20 15:08:24,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:24,576 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 494 [2020-07-20 15:08:24,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:25,411 INFO L225 Difference]: With dead ends: 765567 [2020-07-20 15:08:25,411 INFO L226 Difference]: Without dead ends: 537385 [2020-07-20 15:08:25,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:26,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537385 states. [2020-07-20 15:09:18,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537385 to 537383. [2020-07-20 15:09:18,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 537383 states. [2020-07-20 15:09:19,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537383 states to 537383 states and 852518 transitions. [2020-07-20 15:09:19,370 INFO L78 Accepts]: Start accepts. Automaton has 537383 states and 852518 transitions. Word has length 494 [2020-07-20 15:09:19,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:09:19,371 INFO L479 AbstractCegarLoop]: Abstraction has 537383 states and 852518 transitions. [2020-07-20 15:09:19,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:09:19,371 INFO L276 IsEmpty]: Start isEmpty. Operand 537383 states and 852518 transitions. [2020-07-20 15:09:20,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 15:09:20,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:09:20,106 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:09:20,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:09:20,307 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:09:20,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:09:20,308 INFO L82 PathProgramCache]: Analyzing trace with hash -119159882, now seen corresponding path program 1 times [2020-07-20 15:09:20,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:09:20,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951815536] [2020-07-20 15:09:20,309 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:09:20,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:09:20,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:09:20,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 1404 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:09:20,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:09:21,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:09:21,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:09:21,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951815536] [2020-07-20 15:09:21,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:09:21,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:09:21,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170842234] [2020-07-20 15:09:21,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:09:21,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:09:21,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:09:21,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:09:21,522 INFO L87 Difference]: Start difference. First operand 537383 states and 852518 transitions. Second operand 3 states. [2020-07-20 15:10:42,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:10:42,739 INFO L93 Difference]: Finished difference Result 1481307 states and 2347465 transitions. [2020-07-20 15:10:42,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:10:42,740 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 495 [2020-07-20 15:10:42,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:10:44,468 INFO L225 Difference]: With dead ends: 1481307 [2020-07-20 15:10:44,468 INFO L226 Difference]: Without dead ends: 1010012 [2020-07-20 15:10:44,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:10:45,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1010012 states. [2020-07-20 15:11:52,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1010012 to 548480. [2020-07-20 15:11:52,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 548480 states. [2020-07-20 15:11:53,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 548480 states to 548480 states and 867394 transitions. [2020-07-20 15:11:53,470 INFO L78 Accepts]: Start accepts. Automaton has 548480 states and 867394 transitions. Word has length 495 [2020-07-20 15:11:53,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:53,470 INFO L479 AbstractCegarLoop]: Abstraction has 548480 states and 867394 transitions. [2020-07-20 15:11:53,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:11:53,471 INFO L276 IsEmpty]: Start isEmpty. Operand 548480 states and 867394 transitions. [2020-07-20 15:11:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 15:11:54,119 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:54,119 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:11:54,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:54,320 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:54,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:54,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1762746159, now seen corresponding path program 1 times [2020-07-20 15:11:54,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:54,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135693824] [2020-07-20 15:11:54,322 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:54,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:54,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:54,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 1599 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:11:54,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:54,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:11:54,850 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:54,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135693824] [2020-07-20 15:11:54,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:54,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:11:54,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013953388] [2020-07-20 15:11:54,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:11:54,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:54,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:11:54,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:11:54,852 INFO L87 Difference]: Start difference. First operand 548480 states and 867394 transitions. Second operand 4 states. [2020-07-20 15:13:10,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:13:10,732 INFO L93 Difference]: Finished difference Result 1400228 states and 2223295 transitions. [2020-07-20 15:13:10,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:13:10,733 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-20 15:13:10,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:13:12,028 INFO L225 Difference]: With dead ends: 1400228 [2020-07-20 15:13:12,029 INFO L226 Difference]: Without dead ends: 732967 [2020-07-20 15:13:12,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:13:13,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732967 states.