/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_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 15:11:29,790 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 15:11:29,793 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 15:11:29,810 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 15:11:29,811 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 15:11:29,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 15:11:29,817 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 15:11:29,819 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 15:11:29,820 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 15:11:29,821 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 15:11:29,822 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 15:11:29,823 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 15:11:29,824 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 15:11:29,825 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 15:11:29,826 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 15:11:29,827 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 15:11:29,827 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 15:11:29,828 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 15:11:29,831 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 15:11:29,835 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 15:11:29,837 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 15:11:29,838 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 15:11:29,839 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 15:11:29,840 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 15:11:29,842 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 15:11:29,850 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 15:11:29,851 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 15:11:29,851 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 15:11:29,852 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 15:11:29,867 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 15:11:29,867 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 15:11:29,869 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 15:11:29,869 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 15:11:29,869 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 15:11:29,869 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 15:11:29,870 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 15:11:29,871 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 15:11:29,871 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 15:11:29,871 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 15:11:29,871 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 15:11:29,871 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 15:11:29,872 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 15:11:29,872 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 15:11:29,872 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 15:11:29,872 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 15:11:29,873 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:11:29,873 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 15:11:29,873 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 15:11:29,873 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 15:11:29,873 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 15:11:29,874 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:29,874 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 15:11:29,874 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 15:11:29,874 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 15:11:30,180 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 15:11:30,193 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 15:11:30,196 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 15:11:30,198 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 15:11:30,198 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 15:11:30,199 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 15:11:30,280 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/022cfb52b/30887ddda8bd43e1b1ab9059a493227d/FLAG81398a283 [2020-07-20 15:11:31,051 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 15:11:31,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 15:11:31,073 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/022cfb52b/30887ddda8bd43e1b1ab9059a493227d/FLAG81398a283 [2020-07-20 15:11:31,181 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/022cfb52b/30887ddda8bd43e1b1ab9059a493227d [2020-07-20 15:11:31,192 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 15:11:31,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 15:11:31,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 15:11:31,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 15:11:31,201 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 15:11:31,202 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:11:31" (1/1) ... [2020-07-20 15:11:31,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26f57f9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:31, skipping insertion in model container [2020-07-20 15:11:31,205 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:11:31" (1/1) ... [2020-07-20 15:11:31,214 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 15:11:31,410 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 15:11:32,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:11:32,944 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 15:11:34,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:11:34,086 INFO L208 MainTranslator]: Completed translation [2020-07-20 15:11:34,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34 WrapperNode [2020-07-20 15:11:34,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 15:11:34,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 15:11:34,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 15:11:34,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 15:11:34,103 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,170 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,170 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,245 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,289 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,313 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (1/1) ... [2020-07-20 15:11:34,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 15:11:34,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 15:11:34,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 15:11:34,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 15:11:34,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (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 15:11:34,427 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 15:11:34,428 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 15:11:34,428 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 15:11:34,428 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 15:11:34,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 15:11:34,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 15:11:34,429 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 15:11:34,430 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 15:11:34,430 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 15:11:34,430 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 15:11:34,431 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 15:11:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 15:11:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 15:11:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 15:11:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 15:11:34,433 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 15:11:34,433 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 15:11:34,434 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 15:11:34,434 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 15:11:34,434 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 15:11:34,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 15:11:34,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 15:11:38,284 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 15:11:38,284 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 15:11:38,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:11:38 BoogieIcfgContainer [2020-07-20 15:11:38,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 15:11:38,298 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 15:11:38,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 15:11:38,301 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 15:11:38,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:11:31" (1/3) ... [2020-07-20 15:11:38,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c0889b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:11:38, skipping insertion in model container [2020-07-20 15:11:38,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:11:34" (2/3) ... [2020-07-20 15:11:38,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c0889b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:11:38, skipping insertion in model container [2020-07-20 15:11:38,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:11:38" (3/3) ... [2020-07-20 15:11:38,305 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 15:11:38,315 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 15:11:38,324 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 15:11:38,338 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 15:11:38,367 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 15:11:38,368 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 15:11:38,368 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 15:11:38,368 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 15:11:38,368 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 15:11:38,368 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 15:11:38,368 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 15:11:38,368 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 15:11:38,406 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-07-20 15:11:38,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 15:11:38,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:38,466 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 15:11:38,466 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:38,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:38,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-07-20 15:11:38,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:38,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409160878] [2020-07-20 15:11:38,484 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 15:11:39,024 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:39,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:39,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 1720 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:11:39,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:39,587 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 15:11:39,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:39,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409160878] [2020-07-20 15:11:39,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:39,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:11:39,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111477873] [2020-07-20 15:11:39,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:11:39,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:39,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:11:39,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:11:39,615 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 4 states. [2020-07-20 15:11:40,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:40,008 INFO L93 Difference]: Finished difference Result 4237 states and 7634 transitions. [2020-07-20 15:11:40,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 15:11:40,010 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 487 [2020-07-20 15:11:40,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:40,044 INFO L225 Difference]: With dead ends: 4237 [2020-07-20 15:11:40,044 INFO L226 Difference]: Without dead ends: 2813 [2020-07-20 15:11:40,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:11:40,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2813 states. [2020-07-20 15:11:40,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2813 to 2811. [2020-07-20 15:11:40,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2811 states. [2020-07-20 15:11:40,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2811 states to 2811 states and 4637 transitions. [2020-07-20 15:11:40,254 INFO L78 Accepts]: Start accepts. Automaton has 2811 states and 4637 transitions. Word has length 487 [2020-07-20 15:11:40,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:40,255 INFO L479 AbstractCegarLoop]: Abstraction has 2811 states and 4637 transitions. [2020-07-20 15:11:40,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:11:40,255 INFO L276 IsEmpty]: Start isEmpty. Operand 2811 states and 4637 transitions. [2020-07-20 15:11:40,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 15:11:40,271 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:40,271 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] [2020-07-20 15:11:40,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:40,485 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:40,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:40,486 INFO L82 PathProgramCache]: Analyzing trace with hash -603864616, now seen corresponding path program 1 times [2020-07-20 15:11:40,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:40,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732052767] [2020-07-20 15:11:40,487 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 15:11:40,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:40,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:40,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 1723 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:11:40,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:41,189 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 15:11:41,190 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:41,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732052767] [2020-07-20 15:11:41,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:41,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:11:41,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301030577] [2020-07-20 15:11:41,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:11:41,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:41,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:11:41,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:41,194 INFO L87 Difference]: Start difference. First operand 2811 states and 4637 transitions. Second operand 3 states. [2020-07-20 15:11:41,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:41,529 INFO L93 Difference]: Finished difference Result 8124 states and 13359 transitions. [2020-07-20 15:11:41,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:41,530 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-20 15:11:41,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:41,562 INFO L225 Difference]: With dead ends: 8124 [2020-07-20 15:11:41,563 INFO L226 Difference]: Without dead ends: 5542 [2020-07-20 15:11:41,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 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 15:11:41,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5542 states. [2020-07-20 15:11:41,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5542 to 5540. [2020-07-20 15:11:41,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5540 states. [2020-07-20 15:11:41,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5540 states to 5540 states and 9108 transitions. [2020-07-20 15:11:41,788 INFO L78 Accepts]: Start accepts. Automaton has 5540 states and 9108 transitions. Word has length 489 [2020-07-20 15:11:41,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:41,789 INFO L479 AbstractCegarLoop]: Abstraction has 5540 states and 9108 transitions. [2020-07-20 15:11:41,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:11:41,790 INFO L276 IsEmpty]: Start isEmpty. Operand 5540 states and 9108 transitions. [2020-07-20 15:11:41,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 15:11:41,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:41,813 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 15:11:42,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:42,028 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:42,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:42,030 INFO L82 PathProgramCache]: Analyzing trace with hash -522806972, now seen corresponding path program 1 times [2020-07-20 15:11:42,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:42,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853317645] [2020-07-20 15:11:42,031 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 15:11:42,435 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:42,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:42,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 1723 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:11:42,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:42,623 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 15:11:42,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:42,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853317645] [2020-07-20 15:11:42,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:42,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:11:42,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003140092] [2020-07-20 15:11:42,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:11:42,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:42,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:11:42,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:42,626 INFO L87 Difference]: Start difference. First operand 5540 states and 9108 transitions. Second operand 3 states. [2020-07-20 15:11:42,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:42,958 INFO L93 Difference]: Finished difference Result 16364 states and 26861 transitions. [2020-07-20 15:11:42,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:42,958 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 15:11:42,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:43,011 INFO L225 Difference]: With dead ends: 16364 [2020-07-20 15:11:43,011 INFO L226 Difference]: Without dead ends: 10855 [2020-07-20 15:11:43,026 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 15:11:43,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10855 states. [2020-07-20 15:11:43,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10855 to 5566. [2020-07-20 15:11:43,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5566 states. [2020-07-20 15:11:43,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5566 states to 5566 states and 9146 transitions. [2020-07-20 15:11:43,323 INFO L78 Accepts]: Start accepts. Automaton has 5566 states and 9146 transitions. Word has length 490 [2020-07-20 15:11:43,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:43,324 INFO L479 AbstractCegarLoop]: Abstraction has 5566 states and 9146 transitions. [2020-07-20 15:11:43,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:11:43,324 INFO L276 IsEmpty]: Start isEmpty. Operand 5566 states and 9146 transitions. [2020-07-20 15:11:43,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 15:11:43,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:43,341 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 15:11:43,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:43,555 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:43,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:43,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1278928061, now seen corresponding path program 1 times [2020-07-20 15:11:43,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:43,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974358382] [2020-07-20 15:11:43,557 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 15:11:44,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:44,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:44,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 1722 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:11:44,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:44,349 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 15:11:44,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:44,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974358382] [2020-07-20 15:11:44,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:44,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:11:44,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892281939] [2020-07-20 15:11:44,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:11:44,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:44,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:11:44,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:11:44,354 INFO L87 Difference]: Start difference. First operand 5566 states and 9146 transitions. Second operand 4 states. [2020-07-20 15:11:45,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:45,088 INFO L93 Difference]: Finished difference Result 16182 states and 26530 transitions. [2020-07-20 15:11:45,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:11:45,089 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 491 [2020-07-20 15:11:45,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:45,135 INFO L225 Difference]: With dead ends: 16182 [2020-07-20 15:11:45,136 INFO L226 Difference]: Without dead ends: 10860 [2020-07-20 15:11:45,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 488 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 15:11:45,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10860 states. [2020-07-20 15:11:45,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10860 to 10858. [2020-07-20 15:11:45,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10858 states. [2020-07-20 15:11:45,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10858 states to 10858 states and 17736 transitions. [2020-07-20 15:11:45,562 INFO L78 Accepts]: Start accepts. Automaton has 10858 states and 17736 transitions. Word has length 491 [2020-07-20 15:11:45,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:45,562 INFO L479 AbstractCegarLoop]: Abstraction has 10858 states and 17736 transitions. [2020-07-20 15:11:45,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:11:45,563 INFO L276 IsEmpty]: Start isEmpty. Operand 10858 states and 17736 transitions. [2020-07-20 15:11:45,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 15:11:45,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:45,592 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] [2020-07-20 15:11:45,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:45,808 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:45,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:45,809 INFO L82 PathProgramCache]: Analyzing trace with hash 728691933, now seen corresponding path program 1 times [2020-07-20 15:11:45,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:45,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773893521] [2020-07-20 15:11:45,809 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 15:11:46,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:46,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:46,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 1725 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:11:46,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:46,468 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 15:11:46,468 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:46,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773893521] [2020-07-20 15:11:46,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:46,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:11:46,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488923838] [2020-07-20 15:11:46,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:11:46,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:46,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:11:46,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:46,473 INFO L87 Difference]: Start difference. First operand 10858 states and 17736 transitions. Second operand 3 states. [2020-07-20 15:11:47,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:47,176 INFO L93 Difference]: Finished difference Result 31414 states and 51158 transitions. [2020-07-20 15:11:47,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:47,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 493 [2020-07-20 15:11:47,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:47,234 INFO L225 Difference]: With dead ends: 31414 [2020-07-20 15:11:47,234 INFO L226 Difference]: Without dead ends: 21140 [2020-07-20 15:11:47,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 491 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 15:11:47,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21140 states. [2020-07-20 15:11:48,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21140 to 21138. [2020-07-20 15:11:48,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21138 states. [2020-07-20 15:11:48,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21138 states to 21138 states and 34340 transitions. [2020-07-20 15:11:48,788 INFO L78 Accepts]: Start accepts. Automaton has 21138 states and 34340 transitions. Word has length 493 [2020-07-20 15:11:48,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:48,788 INFO L479 AbstractCegarLoop]: Abstraction has 21138 states and 34340 transitions. [2020-07-20 15:11:48,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:11:48,788 INFO L276 IsEmpty]: Start isEmpty. Operand 21138 states and 34340 transitions. [2020-07-20 15:11:48,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2020-07-20 15:11:48,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:48,836 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 15:11:49,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:49,051 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:49,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:49,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1942779168, now seen corresponding path program 1 times [2020-07-20 15:11:49,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:49,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311542898] [2020-07-20 15:11:49,053 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 15:11:49,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:49,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:49,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 1725 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:11:49,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:49,595 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 15:11:49,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:49,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311542898] [2020-07-20 15:11:49,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:49,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:11:49,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357584619] [2020-07-20 15:11:49,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:11:49,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:49,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:11:49,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:49,599 INFO L87 Difference]: Start difference. First operand 21138 states and 34340 transitions. Second operand 3 states. [2020-07-20 15:11:50,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:50,397 INFO L93 Difference]: Finished difference Result 62386 states and 101174 transitions. [2020-07-20 15:11:50,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:50,398 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 494 [2020-07-20 15:11:50,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:50,511 INFO L225 Difference]: With dead ends: 62386 [2020-07-20 15:11:50,511 INFO L226 Difference]: Without dead ends: 41776 [2020-07-20 15:11:50,568 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 15:11:50,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41776 states. [2020-07-20 15:11:51,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41776 to 21326. [2020-07-20 15:11:51,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21326 states. [2020-07-20 15:11:51,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21326 states to 21326 states and 34636 transitions. [2020-07-20 15:11:51,748 INFO L78 Accepts]: Start accepts. Automaton has 21326 states and 34636 transitions. Word has length 494 [2020-07-20 15:11:51,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:51,748 INFO L479 AbstractCegarLoop]: Abstraction has 21326 states and 34636 transitions. [2020-07-20 15:11:51,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:11:51,749 INFO L276 IsEmpty]: Start isEmpty. Operand 21326 states and 34636 transitions. [2020-07-20 15:11:51,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 15:11:51,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:51,791 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 15:11:52,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:52,006 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:52,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:52,006 INFO L82 PathProgramCache]: Analyzing trace with hash -143894686, now seen corresponding path program 1 times [2020-07-20 15:11:52,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:52,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606233331] [2020-07-20 15:11:52,008 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 15:11:52,418 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:52,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:52,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 1724 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:11:52,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:52,563 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 15:11:52,564 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:52,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606233331] [2020-07-20 15:11:52,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:52,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:11:52,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463120753] [2020-07-20 15:11:52,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:11:52,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:52,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:11:52,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:11:52,566 INFO L87 Difference]: Start difference. First operand 21326 states and 34636 transitions. Second operand 4 states. [2020-07-20 15:11:53,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:53,902 INFO L93 Difference]: Finished difference Result 50950 states and 83383 transitions. [2020-07-20 15:11:53,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:11:53,903 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 495 [2020-07-20 15:11:53,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:53,975 INFO L225 Difference]: With dead ends: 50950 [2020-07-20 15:11:53,975 INFO L226 Difference]: Without dead ends: 25552 [2020-07-20 15:11:54,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 492 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 15:11:54,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25552 states. [2020-07-20 15:11:55,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25552 to 25550. [2020-07-20 15:11:55,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25550 states. [2020-07-20 15:11:55,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25550 states to 25550 states and 41701 transitions. [2020-07-20 15:11:55,040 INFO L78 Accepts]: Start accepts. Automaton has 25550 states and 41701 transitions. Word has length 495 [2020-07-20 15:11:55,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:55,040 INFO L479 AbstractCegarLoop]: Abstraction has 25550 states and 41701 transitions. [2020-07-20 15:11:55,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:11:55,040 INFO L276 IsEmpty]: Start isEmpty. Operand 25550 states and 41701 transitions. [2020-07-20 15:11:55,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-20 15:11:55,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:55,064 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, 1] [2020-07-20 15:11:55,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:55,270 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:55,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:55,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1874990140, now seen corresponding path program 1 times [2020-07-20 15:11:55,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:55,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312477341] [2020-07-20 15:11:55,272 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 15:11:55,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:55,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:55,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 1728 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:11:55,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:55,919 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 15:11:55,919 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:55,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312477341] [2020-07-20 15:11:55,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:55,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:11:55,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489506284] [2020-07-20 15:11:55,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:11:55,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:55,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:11:55,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:11:55,921 INFO L87 Difference]: Start difference. First operand 25550 states and 41701 transitions. Second operand 4 states. [2020-07-20 15:11:56,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:56,739 INFO L93 Difference]: Finished difference Result 35994 states and 58570 transitions. [2020-07-20 15:11:56,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:11:56,739 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 497 [2020-07-20 15:11:56,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:56,789 INFO L225 Difference]: With dead ends: 35994 [2020-07-20 15:11:56,790 INFO L226 Difference]: Without dead ends: 25512 [2020-07-20 15:11:56,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 494 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 15:11:56,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25512 states. [2020-07-20 15:11:57,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25512 to 21276. [2020-07-20 15:11:57,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21276 states. [2020-07-20 15:11:57,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21276 states to 21276 states and 34390 transitions. [2020-07-20 15:11:57,395 INFO L78 Accepts]: Start accepts. Automaton has 21276 states and 34390 transitions. Word has length 497 [2020-07-20 15:11:57,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:11:57,396 INFO L479 AbstractCegarLoop]: Abstraction has 21276 states and 34390 transitions. [2020-07-20 15:11:57,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:11:57,396 INFO L276 IsEmpty]: Start isEmpty. Operand 21276 states and 34390 transitions. [2020-07-20 15:11:57,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 15:11:57,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:11:57,415 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, 1, 1] [2020-07-20 15:11:57,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:11:57,616 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:11:57,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:11:57,617 INFO L82 PathProgramCache]: Analyzing trace with hash -961647352, now seen corresponding path program 1 times [2020-07-20 15:11:57,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:11:57,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829703632] [2020-07-20 15:11:57,619 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 15:11:58,029 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:11:58,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:11:58,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 1727 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:11:58,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:11:58,163 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 15:11:58,164 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:11:58,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [829703632] [2020-07-20 15:11:58,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:11:58,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:11:58,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794502608] [2020-07-20 15:11:58,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:11:58,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:11:58,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:11:58,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:58,167 INFO L87 Difference]: Start difference. First operand 21276 states and 34390 transitions. Second operand 3 states. [2020-07-20 15:11:59,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:59,182 INFO L93 Difference]: Finished difference Result 63412 states and 102466 transitions. [2020-07-20 15:11:59,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:59,183 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-20 15:11:59,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:59,268 INFO L225 Difference]: With dead ends: 63412 [2020-07-20 15:11:59,268 INFO L226 Difference]: Without dead ends: 42354 [2020-07-20 15:11:59,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 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 15:11:59,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42354 states. [2020-07-20 15:12:01,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42354 to 21342. [2020-07-20 15:12:01,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21342 states. [2020-07-20 15:12:01,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21342 states to 21342 states and 34486 transitions. [2020-07-20 15:12:01,127 INFO L78 Accepts]: Start accepts. Automaton has 21342 states and 34486 transitions. Word has length 498 [2020-07-20 15:12:01,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:01,128 INFO L479 AbstractCegarLoop]: Abstraction has 21342 states and 34486 transitions. [2020-07-20 15:12:01,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:01,128 INFO L276 IsEmpty]: Start isEmpty. Operand 21342 states and 34486 transitions. [2020-07-20 15:12:01,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 15:12:01,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:01,152 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, 1, 1, 1] [2020-07-20 15:12:01,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:01,366 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:01,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:01,367 INFO L82 PathProgramCache]: Analyzing trace with hash -861614681, now seen corresponding path program 1 times [2020-07-20 15:12:01,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:01,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733075328] [2020-07-20 15:12:01,369 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 15:12:01,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:01,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:01,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 1738 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:01,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:01,910 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 15:12:01,910 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:01,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733075328] [2020-07-20 15:12:01,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:01,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:01,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126526935] [2020-07-20 15:12:01,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:01,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:01,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:01,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:01,912 INFO L87 Difference]: Start difference. First operand 21342 states and 34486 transitions. Second operand 3 states. [2020-07-20 15:12:02,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:02,671 INFO L93 Difference]: Finished difference Result 41586 states and 66424 transitions. [2020-07-20 15:12:02,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:02,672 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-20 15:12:02,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:02,722 INFO L225 Difference]: With dead ends: 41586 [2020-07-20 15:12:02,723 INFO L226 Difference]: Without dead ends: 28528 [2020-07-20 15:12:02,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 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 15:12:02,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28528 states. [2020-07-20 15:12:03,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28528 to 24414. [2020-07-20 15:12:03,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24414 states. [2020-07-20 15:12:03,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24414 states to 24414 states and 39558 transitions. [2020-07-20 15:12:03,724 INFO L78 Accepts]: Start accepts. Automaton has 24414 states and 39558 transitions. Word has length 499 [2020-07-20 15:12:03,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:03,724 INFO L479 AbstractCegarLoop]: Abstraction has 24414 states and 39558 transitions. [2020-07-20 15:12:03,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:03,724 INFO L276 IsEmpty]: Start isEmpty. Operand 24414 states and 39558 transitions. [2020-07-20 15:12:03,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 15:12:03,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:03,749 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, 1, 1, 1] [2020-07-20 15:12:03,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:03,964 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:03,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:03,965 INFO L82 PathProgramCache]: Analyzing trace with hash 821730243, now seen corresponding path program 1 times [2020-07-20 15:12:03,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:03,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363191290] [2020-07-20 15:12:03,966 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 15:12:04,316 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:12:04,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:04,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 1494 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:12:04,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:04,492 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 15:12:04,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:04,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363191290] [2020-07-20 15:12:04,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:04,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:12:04,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381561406] [2020-07-20 15:12:04,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:12:04,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:04,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:12:04,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:12:04,495 INFO L87 Difference]: Start difference. First operand 24414 states and 39558 transitions. Second operand 9 states. [2020-07-20 15:12:16,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:16,689 INFO L93 Difference]: Finished difference Result 140740 states and 227553 transitions. [2020-07-20 15:12:16,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 15:12:16,690 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 499 [2020-07-20 15:12:16,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:16,848 INFO L225 Difference]: With dead ends: 140740 [2020-07-20 15:12:16,849 INFO L226 Difference]: Without dead ends: 135542 [2020-07-20 15:12:16,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 15:12:16,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135542 states. [2020-07-20 15:12:20,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135542 to 43230. [2020-07-20 15:12:20,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43230 states. [2020-07-20 15:12:20,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43230 states to 43230 states and 69818 transitions. [2020-07-20 15:12:20,727 INFO L78 Accepts]: Start accepts. Automaton has 43230 states and 69818 transitions. Word has length 499 [2020-07-20 15:12:20,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:20,728 INFO L479 AbstractCegarLoop]: Abstraction has 43230 states and 69818 transitions. [2020-07-20 15:12:20,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 15:12:20,728 INFO L276 IsEmpty]: Start isEmpty. Operand 43230 states and 69818 transitions. [2020-07-20 15:12:20,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 15:12:20,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:20,753 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, 1, 1, 1] [2020-07-20 15:12:20,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:20,954 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:20,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:20,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1584908196, now seen corresponding path program 1 times [2020-07-20 15:12:20,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:20,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957880380] [2020-07-20 15:12:20,956 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 15:12:21,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:21,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:21,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 1735 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:21,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:21,503 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 15:12:21,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:21,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957880380] [2020-07-20 15:12:21,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:21,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:21,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587477387] [2020-07-20 15:12:21,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:21,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:21,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:21,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:21,506 INFO L87 Difference]: Start difference. First operand 43230 states and 69818 transitions. Second operand 3 states. [2020-07-20 15:12:24,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:24,036 INFO L93 Difference]: Finished difference Result 95290 states and 153668 transitions. [2020-07-20 15:12:24,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:12:24,037 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-20 15:12:24,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:24,139 INFO L225 Difference]: With dead ends: 95290 [2020-07-20 15:12:24,139 INFO L226 Difference]: Without dead ends: 60772 [2020-07-20 15:12:24,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 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 15:12:24,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60772 states. [2020-07-20 15:12:26,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60772 to 53834. [2020-07-20 15:12:26,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53834 states. [2020-07-20 15:12:26,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53834 states to 53834 states and 87214 transitions. [2020-07-20 15:12:26,839 INFO L78 Accepts]: Start accepts. Automaton has 53834 states and 87214 transitions. Word has length 499 [2020-07-20 15:12:26,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:26,839 INFO L479 AbstractCegarLoop]: Abstraction has 53834 states and 87214 transitions. [2020-07-20 15:12:26,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:12:26,840 INFO L276 IsEmpty]: Start isEmpty. Operand 53834 states and 87214 transitions. [2020-07-20 15:12:26,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 15:12:26,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:26,865 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, 1, 1, 1] [2020-07-20 15:12:27,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:27,066 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:27,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:27,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1886207231, now seen corresponding path program 1 times [2020-07-20 15:12:27,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:27,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845109194] [2020-07-20 15:12:27,068 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 15:12:27,494 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:27,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:27,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 1726 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:12:27,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:27,614 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 15:12:27,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:27,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845109194] [2020-07-20 15:12:27,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:27,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:12:27,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425587944] [2020-07-20 15:12:27,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:12:27,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:27,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:12:27,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:12:27,617 INFO L87 Difference]: Start difference. First operand 53834 states and 87214 transitions. Second operand 4 states. [2020-07-20 15:12:31,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:31,192 INFO L93 Difference]: Finished difference Result 111056 states and 180166 transitions. [2020-07-20 15:12:31,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:12:31,193 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 499 [2020-07-20 15:12:31,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:31,276 INFO L225 Difference]: With dead ends: 111056 [2020-07-20 15:12:31,276 INFO L226 Difference]: Without dead ends: 57950 [2020-07-20 15:12:31,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 496 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 15:12:31,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57950 states. [2020-07-20 15:12:33,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57950 to 53924. [2020-07-20 15:12:33,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53924 states. [2020-07-20 15:12:34,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53924 states to 53924 states and 87352 transitions. [2020-07-20 15:12:34,010 INFO L78 Accepts]: Start accepts. Automaton has 53924 states and 87352 transitions. Word has length 499 [2020-07-20 15:12:34,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:34,010 INFO L479 AbstractCegarLoop]: Abstraction has 53924 states and 87352 transitions. [2020-07-20 15:12:34,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:12:34,010 INFO L276 IsEmpty]: Start isEmpty. Operand 53924 states and 87352 transitions. [2020-07-20 15:12:34,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 15:12:34,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:34,043 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, 1, 1, 1, 1, 1] [2020-07-20 15:12:34,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:34,252 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:34,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:34,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1027733439, now seen corresponding path program 1 times [2020-07-20 15:12:34,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:34,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696356215] [2020-07-20 15:12:34,254 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 15:12:34,664 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:34,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:34,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 1730 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:12:34,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:35,214 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 15:12:35,215 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:35,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696356215] [2020-07-20 15:12:35,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:35,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:12:35,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329657496] [2020-07-20 15:12:35,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:12:35,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:35,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:12:35,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:12:35,216 INFO L87 Difference]: Start difference. First operand 53924 states and 87352 transitions. Second operand 4 states. [2020-07-20 15:12:41,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:41,180 INFO L93 Difference]: Finished difference Result 159583 states and 258452 transitions. [2020-07-20 15:12:41,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:12:41,181 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-20 15:12:41,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:41,303 INFO L225 Difference]: With dead ends: 159583 [2020-07-20 15:12:41,303 INFO L226 Difference]: Without dead ends: 106625 [2020-07-20 15:12:41,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 498 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 15:12:41,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106625 states. [2020-07-20 15:12:46,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106625 to 106623. [2020-07-20 15:12:46,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106623 states. [2020-07-20 15:12:46,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106623 states to 106623 states and 172222 transitions. [2020-07-20 15:12:46,698 INFO L78 Accepts]: Start accepts. Automaton has 106623 states and 172222 transitions. Word has length 501 [2020-07-20 15:12:46,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:46,699 INFO L479 AbstractCegarLoop]: Abstraction has 106623 states and 172222 transitions. [2020-07-20 15:12:46,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:12:46,699 INFO L276 IsEmpty]: Start isEmpty. Operand 106623 states and 172222 transitions. [2020-07-20 15:12:46,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 15:12:46,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:46,745 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:12:46,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:46,946 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:46,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:46,947 INFO L82 PathProgramCache]: Analyzing trace with hash 355683107, now seen corresponding path program 1 times [2020-07-20 15:12:46,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:46,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224574557] [2020-07-20 15:12:46,948 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 15:12:47,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:12:47,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:47,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 1730 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:12:47,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:47,934 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 15:12:47,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:47,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224574557] [2020-07-20 15:12:47,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:47,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:12:47,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642117473] [2020-07-20 15:12:47,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:12:47,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:47,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:12:47,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:12:47,937 INFO L87 Difference]: Start difference. First operand 106623 states and 172222 transitions. Second operand 4 states. [2020-07-20 15:12:59,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:12:59,611 INFO L93 Difference]: Finished difference Result 317528 states and 512865 transitions. [2020-07-20 15:12:59,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:12:59,612 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 503 [2020-07-20 15:12:59,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:12:59,926 INFO L225 Difference]: With dead ends: 317528 [2020-07-20 15:12:59,927 INFO L226 Difference]: Without dead ends: 210942 [2020-07-20 15:13:00,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 500 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 15:13:00,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210942 states. [2020-07-20 15:13:14,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210942 to 210940. [2020-07-20 15:13:14,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210940 states. [2020-07-20 15:13:15,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210940 states to 210940 states and 339483 transitions. [2020-07-20 15:13:15,147 INFO L78 Accepts]: Start accepts. Automaton has 210940 states and 339483 transitions. Word has length 503 [2020-07-20 15:13:15,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:13:15,148 INFO L479 AbstractCegarLoop]: Abstraction has 210940 states and 339483 transitions. [2020-07-20 15:13:15,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:13:15,148 INFO L276 IsEmpty]: Start isEmpty. Operand 210940 states and 339483 transitions. [2020-07-20 15:13:15,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-20 15:13:15,248 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:13:15,248 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:13:15,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:13:15,449 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:13:15,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:13:15,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1664756029, now seen corresponding path program 1 times [2020-07-20 15:13:15,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:13:15,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259705793] [2020-07-20 15:13:15,451 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 15:13:15,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:13:15,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:13:15,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 1485 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:13:15,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:13:15,963 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 15:13:15,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:13:15,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259705793] [2020-07-20 15:13:15,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:13:15,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:13:15,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820686728] [2020-07-20 15:13:15,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:13:15,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:13:15,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:13:15,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:13:15,967 INFO L87 Difference]: Start difference. First operand 210940 states and 339483 transitions. Second operand 3 states. [2020-07-20 15:13:40,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:13:40,157 INFO L93 Difference]: Finished difference Result 632611 states and 1018111 transitions. [2020-07-20 15:13:40,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:13:40,157 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-20 15:13:40,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:13:40,800 INFO L225 Difference]: With dead ends: 632611 [2020-07-20 15:13:40,801 INFO L226 Difference]: Without dead ends: 421755 [2020-07-20 15:13:40,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 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 15:13:41,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421755 states. [2020-07-20 15:14:00,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421755 to 211028. [2020-07-20 15:14:00,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211028 states. [2020-07-20 15:14:01,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211028 states to 211028 states and 339599 transitions. [2020-07-20 15:14:01,620 INFO L78 Accepts]: Start accepts. Automaton has 211028 states and 339599 transitions. Word has length 506 [2020-07-20 15:14:01,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:14:01,620 INFO L479 AbstractCegarLoop]: Abstraction has 211028 states and 339599 transitions. [2020-07-20 15:14:01,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:14:01,620 INFO L276 IsEmpty]: Start isEmpty. Operand 211028 states and 339599 transitions. [2020-07-20 15:14:01,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 15:14:01,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:14:01,724 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:14:01,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:14:01,925 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:14:01,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:14:01,926 INFO L82 PathProgramCache]: Analyzing trace with hash -393364926, now seen corresponding path program 1 times [2020-07-20 15:14:01,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:14:01,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728790367] [2020-07-20 15:14:01,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:14:02,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:14:02,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:14:02,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 1488 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:14:02,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:14:02,372 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 15:14:02,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:14:02,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728790367] [2020-07-20 15:14:02,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:14:02,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:14:02,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642458909] [2020-07-20 15:14:02,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:14:02,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:14:02,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:14:02,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:14:02,375 INFO L87 Difference]: Start difference. First operand 211028 states and 339599 transitions. Second operand 4 states. [2020-07-20 15:14:29,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:14:29,106 INFO L93 Difference]: Finished difference Result 624648 states and 1004266 transitions. [2020-07-20 15:14:29,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:14:29,106 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 509 [2020-07-20 15:14:29,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:14:29,716 INFO L225 Difference]: With dead ends: 624648 [2020-07-20 15:14:29,716 INFO L226 Difference]: Without dead ends: 421790 [2020-07-20 15:14:29,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 506 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 15:14:30,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421790 states. [2020-07-20 15:14:51,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421790 to 220212. [2020-07-20 15:14:51,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220212 states. [2020-07-20 15:14:52,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220212 states to 220212 states and 355320 transitions. [2020-07-20 15:14:52,258 INFO L78 Accepts]: Start accepts. Automaton has 220212 states and 355320 transitions. Word has length 509 [2020-07-20 15:14:52,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:14:52,258 INFO L479 AbstractCegarLoop]: Abstraction has 220212 states and 355320 transitions. [2020-07-20 15:14:52,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:14:52,259 INFO L276 IsEmpty]: Start isEmpty. Operand 220212 states and 355320 transitions. [2020-07-20 15:14:52,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 15:14:52,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:14:52,371 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:14:52,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:14:52,579 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:14:52,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:14:52,580 INFO L82 PathProgramCache]: Analyzing trace with hash 289180041, now seen corresponding path program 1 times [2020-07-20 15:14:52,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:14:52,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493669888] [2020-07-20 15:14:52,581 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 15:14:52,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:14:52,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:14:52,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 1482 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:14:52,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:14:53,041 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 15:14:53,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:14:53,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493669888] [2020-07-20 15:14:53,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:14:53,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:14:53,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668190429] [2020-07-20 15:14:53,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:14:53,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:14:53,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:14:53,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:14:53,043 INFO L87 Difference]: Start difference. First operand 220212 states and 355320 transitions. Second operand 4 states. [2020-07-20 15:15:23,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:15:23,440 INFO L93 Difference]: Finished difference Result 644374 states and 1038098 transitions. [2020-07-20 15:15:23,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:15:23,441 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 509 [2020-07-20 15:15:23,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:15:24,013 INFO L225 Difference]: With dead ends: 644374 [2020-07-20 15:15:24,013 INFO L226 Difference]: Without dead ends: 439788 [2020-07-20 15:15:24,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 506 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 15:15:24,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439788 states. [2020-07-20 15:15:49,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439788 to 238338. [2020-07-20 15:15:49,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238338 states. [2020-07-20 15:15:49,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238338 states to 238338 states and 386144 transitions. [2020-07-20 15:15:49,695 INFO L78 Accepts]: Start accepts. Automaton has 238338 states and 386144 transitions. Word has length 509 [2020-07-20 15:15:49,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:15:49,695 INFO L479 AbstractCegarLoop]: Abstraction has 238338 states and 386144 transitions. [2020-07-20 15:15:49,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:15:49,696 INFO L276 IsEmpty]: Start isEmpty. Operand 238338 states and 386144 transitions. [2020-07-20 15:15:49,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 15:15:49,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:15:49,830 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:15:50,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:15:50,031 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:15:50,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:15:50,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1388931590, now seen corresponding path program 1 times [2020-07-20 15:15:50,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:15:50,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010586625] [2020-07-20 15:15:50,033 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 15:15:50,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:15:50,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:15:50,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:15:50,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:15:50,649 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 15:15:50,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:15:50,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010586625] [2020-07-20 15:15:50,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:15:50,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:15:50,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225734064] [2020-07-20 15:15:50,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:15:50,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:15:50,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:15:50,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:15:50,651 INFO L87 Difference]: Start difference. First operand 238338 states and 386144 transitions. Second operand 4 states. [2020-07-20 15:16:25,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:16:25,134 INFO L93 Difference]: Finished difference Result 694295 states and 1123550 transitions. [2020-07-20 15:16:25,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:16:25,135 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 509 [2020-07-20 15:16:25,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:16:25,791 INFO L225 Difference]: With dead ends: 694295 [2020-07-20 15:16:25,792 INFO L226 Difference]: Without dead ends: 456335 [2020-07-20 15:16:25,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 506 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 15:16:26,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456335 states. [2020-07-20 15:17:04,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456335 to 455485. [2020-07-20 15:17:04,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 455485 states. [2020-07-20 15:17:05,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455485 states to 455485 states and 733890 transitions. [2020-07-20 15:17:05,388 INFO L78 Accepts]: Start accepts. Automaton has 455485 states and 733890 transitions. Word has length 509 [2020-07-20 15:17:05,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:17:05,388 INFO L479 AbstractCegarLoop]: Abstraction has 455485 states and 733890 transitions. [2020-07-20 15:17:05,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:17:05,388 INFO L276 IsEmpty]: Start isEmpty. Operand 455485 states and 733890 transitions. [2020-07-20 15:17:05,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 515 [2020-07-20 15:17:05,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:17:05,635 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:17:05,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:17:05,836 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:17:05,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:17:05,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1143333702, now seen corresponding path program 1 times [2020-07-20 15:17:05,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:17:05,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930280571] [2020-07-20 15:17:05,838 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 15:17:06,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:17:06,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:17:06,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 1974 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:17:06,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:17:07,436 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 15:17:07,436 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:17:07,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930280571] [2020-07-20 15:17:07,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:17:07,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:17:07,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832409180] [2020-07-20 15:17:07,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:17:07,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:17:07,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:17:07,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:17:07,438 INFO L87 Difference]: Start difference. First operand 455485 states and 733890 transitions. Second operand 3 states. [2020-07-20 15:18:21,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:18:21,206 INFO L93 Difference]: Finished difference Result 1289460 states and 2071926 transitions. [2020-07-20 15:18:21,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:18:21,207 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 514 [2020-07-20 15:18:21,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:18:23,040 INFO L225 Difference]: With dead ends: 1289460 [2020-07-20 15:18:23,040 INFO L226 Difference]: Without dead ends: 874244 [2020-07-20 15:18:23,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 512 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 15:18:23,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874244 states. [2020-07-20 15:19:49,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874244 to 874242. [2020-07-20 15:19:49,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 874242 states. [2020-07-20 15:19:52,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874242 states to 874242 states and 1401806 transitions. [2020-07-20 15:19:52,088 INFO L78 Accepts]: Start accepts. Automaton has 874242 states and 1401806 transitions. Word has length 514 [2020-07-20 15:19:52,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:19:52,089 INFO L479 AbstractCegarLoop]: Abstraction has 874242 states and 1401806 transitions. [2020-07-20 15:19:52,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:19:52,089 INFO L276 IsEmpty]: Start isEmpty. Operand 874242 states and 1401806 transitions. [2020-07-20 15:19:52,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2020-07-20 15:19:52,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:19:52,600 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:19:52,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:19:52,801 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:19:52,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:19:52,802 INFO L82 PathProgramCache]: Analyzing trace with hash 1651273953, now seen corresponding path program 1 times [2020-07-20 15:19:52,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:19:52,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173376690] [2020-07-20 15:19:52,803 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 15:19:53,152 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:19:53,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:19:53,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 1490 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:19:53,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:19:53,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:19:53,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:19:53,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173376690] [2020-07-20 15:19:53,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:19:53,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:19:53,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033770178] [2020-07-20 15:19:53,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:19:53,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:19:53,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:19:53,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:19:53,271 INFO L87 Difference]: Start difference. First operand 874242 states and 1401806 transitions. Second operand 4 states. [2020-07-20 15:22:21,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:22:21,900 INFO L93 Difference]: Finished difference Result 2485852 states and 3975101 transitions. [2020-07-20 15:22:21,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:22:21,901 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 515 [2020-07-20 15:22:21,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:22:25,650 INFO L225 Difference]: With dead ends: 2485852 [2020-07-20 15:22:25,650 INFO L226 Difference]: Without dead ends: 1693732 [2020-07-20 15:22:26,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 512 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 15:22:27,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1693732 states.