/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 23:10:36,809 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 23:10:36,813 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 23:10:36,830 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 23:10:36,830 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 23:10:36,832 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 23:10:36,834 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 23:10:36,844 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 23:10:36,849 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 23:10:36,851 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 23:10:36,853 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 23:10:36,854 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 23:10:36,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 23:10:36,856 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 23:10:36,858 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 23:10:36,859 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 23:10:36,862 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 23:10:36,863 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 23:10:36,864 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 23:10:36,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 23:10:36,874 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 23:10:36,875 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 23:10:36,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 23:10:36,876 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 23:10:36,879 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 23:10:36,879 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 23:10:36,879 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 23:10:36,880 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 23:10:36,880 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 23:10:36,881 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-20 23:10:36,885 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 23:10:36,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 23:10:36,887 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 23:10:36,887 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 23:10:36,902 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 23:10:36,902 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 23:10:36,903 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 23:10:36,903 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 23:10:36,904 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 23:10:36,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 23:10:36,904 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 23:10:36,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 23:10:36,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 23:10:36,905 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 23:10:36,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 23:10:36,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 23:10:36,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 23:10:36,905 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 23:10:36,906 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 23:10:36,906 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 23:10:36,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 23:10:36,906 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 23:10:36,906 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 23:10:36,906 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 23:10:36,907 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 23:10:36,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 23:10:36,907 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 23:10:36,907 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 23:10:36,907 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 23:10:36,908 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 23:10:36,908 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:36,908 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 23:10:36,908 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 23:10:36,908 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 23:10:37,191 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 23:10:37,208 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 23:10:37,211 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 23:10:37,212 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 23:10:37,212 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 23:10:37,213 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 23:10:37,273 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb001250b/5eb70b1e2b4f450c8a015274215e67ee/FLAG946ddf7fe [2020-07-20 23:10:38,030 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 23:10:38,031 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 23:10:38,055 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb001250b/5eb70b1e2b4f450c8a015274215e67ee/FLAG946ddf7fe [2020-07-20 23:10:38,158 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb001250b/5eb70b1e2b4f450c8a015274215e67ee [2020-07-20 23:10:38,166 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 23:10:38,169 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 23:10:38,171 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 23:10:38,171 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 23:10:38,175 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 23:10:38,176 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:10:38" (1/1) ... [2020-07-20 23:10:38,179 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2efca680 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:38, skipping insertion in model container [2020-07-20 23:10:38,179 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:10:38" (1/1) ... [2020-07-20 23:10:38,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 23:10:38,396 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 23:10:39,908 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:10:39,922 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 23:10:41,393 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:10:41,443 INFO L208 MainTranslator]: Completed translation [2020-07-20 23:10:41,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41 WrapperNode [2020-07-20 23:10:41,444 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 23:10:41,445 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 23:10:41,445 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 23:10:41,445 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 23:10:41,465 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,468 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,533 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,533 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,614 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,664 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,681 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (1/1) ... [2020-07-20 23:10:41,698 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 23:10:41,698 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 23:10:41,699 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 23:10:41,699 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 23:10:41,700 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (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 23:10:41,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 23:10:41,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 23:10:41,775 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 23:10:41,776 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 23:10:41,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 23:10:41,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 23:10:41,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 23:10:41,778 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 23:10:41,778 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 23:10:41,779 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 23:10:41,779 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 23:10:41,780 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 23:10:41,780 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 23:10:41,780 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 23:10:41,780 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 23:10:41,781 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 23:10:41,782 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 23:10:41,782 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 23:10:41,782 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 23:10:41,783 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 23:10:41,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 23:10:41,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 23:10:45,513 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 23:10:45,514 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 23:10:45,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:10:45 BoogieIcfgContainer [2020-07-20 23:10:45,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 23:10:45,541 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 23:10:45,541 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 23:10:45,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 23:10:45,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:10:38" (1/3) ... [2020-07-20 23:10:45,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@492f3cd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:10:45, skipping insertion in model container [2020-07-20 23:10:45,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:10:41" (2/3) ... [2020-07-20 23:10:45,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@492f3cd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:10:45, skipping insertion in model container [2020-07-20 23:10:45,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:10:45" (3/3) ... [2020-07-20 23:10:45,552 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 23:10:45,568 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 23:10:45,581 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 23:10:45,601 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 23:10:45,647 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 23:10:45,647 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 23:10:45,647 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 23:10:45,648 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 23:10:45,648 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 23:10:45,648 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 23:10:45,648 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 23:10:45,649 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 23:10:45,705 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-07-20 23:10:45,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 23:10:45,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:45,776 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:10:45,777 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:45,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:45,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-07-20 23:10:45,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:45,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986908732] [2020-07-20 23:10:45,801 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 23:10:46,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:46,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:46,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 1724 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:10:46,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:46,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:46,969 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:46,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986908732] [2020-07-20 23:10:46,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:46,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:10:46,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401971380] [2020-07-20 23:10:46,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:10:46,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:46,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:10:46,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:10:46,993 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 4 states. [2020-07-20 23:10:47,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:47,388 INFO L93 Difference]: Finished difference Result 4237 states and 7634 transitions. [2020-07-20 23:10:47,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 23:10:47,390 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 487 [2020-07-20 23:10:47,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:47,425 INFO L225 Difference]: With dead ends: 4237 [2020-07-20 23:10:47,425 INFO L226 Difference]: Without dead ends: 2813 [2020-07-20 23:10:47,436 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 23:10:47,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2813 states. [2020-07-20 23:10:47,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2813 to 2811. [2020-07-20 23:10:47,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2811 states. [2020-07-20 23:10:47,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2811 states to 2811 states and 4637 transitions. [2020-07-20 23:10:47,621 INFO L78 Accepts]: Start accepts. Automaton has 2811 states and 4637 transitions. Word has length 487 [2020-07-20 23:10:47,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:10:47,622 INFO L479 AbstractCegarLoop]: Abstraction has 2811 states and 4637 transitions. [2020-07-20 23:10:47,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:10:47,622 INFO L276 IsEmpty]: Start isEmpty. Operand 2811 states and 4637 transitions. [2020-07-20 23:10:47,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 23:10:47,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:47,637 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 23:10:47,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:47,852 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:47,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:47,853 INFO L82 PathProgramCache]: Analyzing trace with hash -603864616, now seen corresponding path program 1 times [2020-07-20 23:10:47,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:47,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080665507] [2020-07-20 23:10:47,854 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 23:10:48,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:48,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:48,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 1727 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:10:48,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:48,636 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:48,636 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:48,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080665507] [2020-07-20 23:10:48,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:48,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:10:48,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576639933] [2020-07-20 23:10:48,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:10:48,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:48,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:10:48,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:10:48,641 INFO L87 Difference]: Start difference. First operand 2811 states and 4637 transitions. Second operand 3 states. [2020-07-20 23:10:48,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:48,939 INFO L93 Difference]: Finished difference Result 8124 states and 13359 transitions. [2020-07-20 23:10:48,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:10:48,940 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-20 23:10:48,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:49,001 INFO L225 Difference]: With dead ends: 8124 [2020-07-20 23:10:49,002 INFO L226 Difference]: Without dead ends: 5542 [2020-07-20 23:10:49,010 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 23:10:49,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5542 states. [2020-07-20 23:10:49,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5542 to 5540. [2020-07-20 23:10:49,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5540 states. [2020-07-20 23:10:49,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5540 states to 5540 states and 9108 transitions. [2020-07-20 23:10:49,298 INFO L78 Accepts]: Start accepts. Automaton has 5540 states and 9108 transitions. Word has length 489 [2020-07-20 23:10:49,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:10:49,304 INFO L479 AbstractCegarLoop]: Abstraction has 5540 states and 9108 transitions. [2020-07-20 23:10:49,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:10:49,304 INFO L276 IsEmpty]: Start isEmpty. Operand 5540 states and 9108 transitions. [2020-07-20 23:10:49,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 23:10:49,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:49,327 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 23:10:49,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:49,540 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:49,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:49,541 INFO L82 PathProgramCache]: Analyzing trace with hash -522806972, now seen corresponding path program 1 times [2020-07-20 23:10:49,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:49,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781552876] [2020-07-20 23:10:49,543 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 23:10:49,982 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:49,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:49,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 1727 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:10:49,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:50,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:50,196 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:50,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781552876] [2020-07-20 23:10:50,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:50,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:10:50,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535254689] [2020-07-20 23:10:50,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:10:50,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:50,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:10:50,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:10:50,199 INFO L87 Difference]: Start difference. First operand 5540 states and 9108 transitions. Second operand 3 states. [2020-07-20 23:10:50,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:50,535 INFO L93 Difference]: Finished difference Result 16364 states and 26861 transitions. [2020-07-20 23:10:50,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:10:50,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 23:10:50,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:50,589 INFO L225 Difference]: With dead ends: 16364 [2020-07-20 23:10:50,590 INFO L226 Difference]: Without dead ends: 10855 [2020-07-20 23:10:50,606 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 23:10:50,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10855 states. [2020-07-20 23:10:50,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10855 to 5566. [2020-07-20 23:10:50,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5566 states. [2020-07-20 23:10:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5566 states to 5566 states and 9146 transitions. [2020-07-20 23:10:50,912 INFO L78 Accepts]: Start accepts. Automaton has 5566 states and 9146 transitions. Word has length 490 [2020-07-20 23:10:50,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:10:50,912 INFO L479 AbstractCegarLoop]: Abstraction has 5566 states and 9146 transitions. [2020-07-20 23:10:50,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:10:50,913 INFO L276 IsEmpty]: Start isEmpty. Operand 5566 states and 9146 transitions. [2020-07-20 23:10:50,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 23:10:50,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:50,940 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 23:10:51,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:51,154 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:51,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:51,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1278928061, now seen corresponding path program 1 times [2020-07-20 23:10:51,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:51,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241671347] [2020-07-20 23:10:51,156 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 23:10:51,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:51,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:51,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 1726 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:10:51,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:51,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:51,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:51,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241671347] [2020-07-20 23:10:51,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:51,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:10:51,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567154958] [2020-07-20 23:10:51,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:10:51,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:51,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:10:51,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:10:51,830 INFO L87 Difference]: Start difference. First operand 5566 states and 9146 transitions. Second operand 4 states. [2020-07-20 23:10:52,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:52,310 INFO L93 Difference]: Finished difference Result 16041 states and 26273 transitions. [2020-07-20 23:10:52,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:10:52,310 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 491 [2020-07-20 23:10:52,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:52,356 INFO L225 Difference]: With dead ends: 16041 [2020-07-20 23:10:52,357 INFO L226 Difference]: Without dead ends: 10759 [2020-07-20 23:10:52,374 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 23:10:52,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10759 states. [2020-07-20 23:10:52,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10759 to 10757. [2020-07-20 23:10:52,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10757 states. [2020-07-20 23:10:52,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10757 states to 10757 states and 17567 transitions. [2020-07-20 23:10:52,938 INFO L78 Accepts]: Start accepts. Automaton has 10757 states and 17567 transitions. Word has length 491 [2020-07-20 23:10:52,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:10:52,939 INFO L479 AbstractCegarLoop]: Abstraction has 10757 states and 17567 transitions. [2020-07-20 23:10:52,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:10:52,939 INFO L276 IsEmpty]: Start isEmpty. Operand 10757 states and 17567 transitions. [2020-07-20 23:10:52,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 23:10:52,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:52,976 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 23:10:53,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:53,191 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:53,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:53,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1329199647, now seen corresponding path program 1 times [2020-07-20 23:10:53,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:53,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812487206] [2020-07-20 23:10:53,193 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 23:10:53,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:53,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:53,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 1730 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:10:53,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:54,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:54,474 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:54,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812487206] [2020-07-20 23:10:54,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:54,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:10:54,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219489161] [2020-07-20 23:10:54,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:10:54,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:54,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:10:54,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:10:54,477 INFO L87 Difference]: Start difference. First operand 10757 states and 17567 transitions. Second operand 4 states. [2020-07-20 23:10:55,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:55,163 INFO L93 Difference]: Finished difference Result 31699 states and 51713 transitions. [2020-07-20 23:10:55,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:10:55,164 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 493 [2020-07-20 23:10:55,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:55,224 INFO L225 Difference]: With dead ends: 31699 [2020-07-20 23:10:55,224 INFO L226 Difference]: Without dead ends: 21129 [2020-07-20 23:10:55,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:10:55,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21129 states. [2020-07-20 23:10:56,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21129 to 21127. [2020-07-20 23:10:56,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21127 states. [2020-07-20 23:10:56,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21127 states to 21127 states and 34320 transitions. [2020-07-20 23:10:56,087 INFO L78 Accepts]: Start accepts. Automaton has 21127 states and 34320 transitions. Word has length 493 [2020-07-20 23:10:56,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:10:56,088 INFO L479 AbstractCegarLoop]: Abstraction has 21127 states and 34320 transitions. [2020-07-20 23:10:56,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:10:56,088 INFO L276 IsEmpty]: Start isEmpty. Operand 21127 states and 34320 transitions. [2020-07-20 23:10:56,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 23:10:56,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:10:56,132 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 23:10:56,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:10:56,347 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:10:56,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:10:56,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1462593247, now seen corresponding path program 1 times [2020-07-20 23:10:56,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:10:56,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963216672] [2020-07-20 23:10:56,348 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 23:10:56,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:10:56,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:10:56,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 1729 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:10:56,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:10:57,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:10:57,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:10:57,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963216672] [2020-07-20 23:10:57,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:10:57,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:10:57,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392099382] [2020-07-20 23:10:57,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:10:57,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:10:57,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:10:57,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:10:57,041 INFO L87 Difference]: Start difference. First operand 21127 states and 34320 transitions. Second operand 4 states. [2020-07-20 23:10:58,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:10:58,062 INFO L93 Difference]: Finished difference Result 62877 states and 102112 transitions. [2020-07-20 23:10:58,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:10:58,063 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 495 [2020-07-20 23:10:58,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:10:58,160 INFO L225 Difference]: With dead ends: 62877 [2020-07-20 23:10:58,161 INFO L226 Difference]: Without dead ends: 41787 [2020-07-20 23:10:58,216 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 23:10:58,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41787 states. [2020-07-20 23:11:00,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41787 to 41785. [2020-07-20 23:11:00,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41785 states. [2020-07-20 23:11:00,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41785 states to 41785 states and 67580 transitions. [2020-07-20 23:11:00,270 INFO L78 Accepts]: Start accepts. Automaton has 41785 states and 67580 transitions. Word has length 495 [2020-07-20 23:11:00,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:00,270 INFO L479 AbstractCegarLoop]: Abstraction has 41785 states and 67580 transitions. [2020-07-20 23:11:00,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:11:00,271 INFO L276 IsEmpty]: Start isEmpty. Operand 41785 states and 67580 transitions. [2020-07-20 23:11:00,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 23:11:00,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:00,374 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 23:11:00,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:00,589 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:00,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:00,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1565889151, now seen corresponding path program 1 times [2020-07-20 23:11:00,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:00,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991641735] [2020-07-20 23:11:00,591 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 23:11:01,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:01,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:01,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 1479 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:01,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:01,249 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:01,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991641735] [2020-07-20 23:11:01,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:01,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:01,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464608629] [2020-07-20 23:11:01,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:01,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:01,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:01,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:01,252 INFO L87 Difference]: Start difference. First operand 41785 states and 67580 transitions. Second operand 3 states. [2020-07-20 23:11:02,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:02,904 INFO L93 Difference]: Finished difference Result 125122 states and 202351 transitions. [2020-07-20 23:11:02,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:02,905 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-20 23:11:02,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:03,112 INFO L225 Difference]: With dead ends: 125122 [2020-07-20 23:11:03,112 INFO L226 Difference]: Without dead ends: 83421 [2020-07-20 23:11:03,197 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 23:11:03,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83421 states. [2020-07-20 23:11:05,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83421 to 41864. [2020-07-20 23:11:05,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41864 states. [2020-07-20 23:11:05,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41864 states to 41864 states and 67684 transitions. [2020-07-20 23:11:05,902 INFO L78 Accepts]: Start accepts. Automaton has 41864 states and 67684 transitions. Word has length 498 [2020-07-20 23:11:05,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:05,902 INFO L479 AbstractCegarLoop]: Abstraction has 41864 states and 67684 transitions. [2020-07-20 23:11:05,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:05,902 INFO L276 IsEmpty]: Start isEmpty. Operand 41864 states and 67684 transitions. [2020-07-20 23:11:05,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 23:11:05,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:05,948 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] [2020-07-20 23:11:06,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:06,164 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:06,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:06,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1337023187, now seen corresponding path program 1 times [2020-07-20 23:11:06,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:06,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257936005] [2020-07-20 23:11:06,167 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 23:11:06,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:06,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:06,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 1972 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:06,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:07,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:07,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:07,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257936005] [2020-07-20 23:11:07,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:07,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:07,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018524603] [2020-07-20 23:11:07,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:07,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:07,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:07,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:07,048 INFO L87 Difference]: Start difference. First operand 41864 states and 67684 transitions. Second operand 3 states. [2020-07-20 23:11:08,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:08,594 INFO L93 Difference]: Finished difference Result 82040 states and 131090 transitions. [2020-07-20 23:11:08,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:08,594 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 23:11:08,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:08,697 INFO L225 Difference]: With dead ends: 82040 [2020-07-20 23:11:08,698 INFO L226 Difference]: Without dead ends: 56338 [2020-07-20 23:11:08,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:08,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56338 states. [2020-07-20 23:11:10,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56338 to 47904. [2020-07-20 23:11:10,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47904 states. [2020-07-20 23:11:10,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47904 states to 47904 states and 77692 transitions. [2020-07-20 23:11:10,177 INFO L78 Accepts]: Start accepts. Automaton has 47904 states and 77692 transitions. Word has length 500 [2020-07-20 23:11:10,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:10,178 INFO L479 AbstractCegarLoop]: Abstraction has 47904 states and 77692 transitions. [2020-07-20 23:11:10,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:10,178 INFO L276 IsEmpty]: Start isEmpty. Operand 47904 states and 77692 transitions. [2020-07-20 23:11:10,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 23:11:10,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:10,225 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 23:11:10,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:10,433 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:10,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:10,434 INFO L82 PathProgramCache]: Analyzing trace with hash 505177342, now seen corresponding path program 1 times [2020-07-20 23:11:10,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:10,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459031047] [2020-07-20 23:11:10,436 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 23:11:11,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:11,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:11,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 1482 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:11:11,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:11,180 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:11,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:11,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459031047] [2020-07-20 23:11:11,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:11,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:11:11,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643011540] [2020-07-20 23:11:11,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:11:11,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:11,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:11:11,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:11:11,184 INFO L87 Difference]: Start difference. First operand 47904 states and 77692 transitions. Second operand 4 states. [2020-07-20 23:11:15,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:15,097 INFO L93 Difference]: Finished difference Result 139824 states and 226132 transitions. [2020-07-20 23:11:15,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:11:15,097 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-20 23:11:15,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:15,242 INFO L225 Difference]: With dead ends: 139824 [2020-07-20 23:11:15,242 INFO L226 Difference]: Without dead ends: 95638 [2020-07-20 23:11:15,309 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 23:11:15,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95638 states. [2020-07-20 23:11:17,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95638 to 52092. [2020-07-20 23:11:17,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52092 states. [2020-07-20 23:11:17,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52092 states to 52092 states and 85106 transitions. [2020-07-20 23:11:17,400 INFO L78 Accepts]: Start accepts. Automaton has 52092 states and 85106 transitions. Word has length 501 [2020-07-20 23:11:17,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:17,401 INFO L479 AbstractCegarLoop]: Abstraction has 52092 states and 85106 transitions. [2020-07-20 23:11:17,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:11:17,401 INFO L276 IsEmpty]: Start isEmpty. Operand 52092 states and 85106 transitions. [2020-07-20 23:11:17,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 23:11:17,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:17,435 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 23:11:17,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:17,636 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:17,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:17,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1194748741, now seen corresponding path program 1 times [2020-07-20 23:11:17,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:17,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1739282407] [2020-07-20 23:11:17,638 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:18,002 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:18,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:18,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 1479 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:11:18,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:18,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:18,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:18,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1739282407] [2020-07-20 23:11:18,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:18,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:11:18,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601454987] [2020-07-20 23:11:18,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:11:18,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:18,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:11:18,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:11:18,210 INFO L87 Difference]: Start difference. First operand 52092 states and 85106 transitions. Second operand 4 states. [2020-07-20 23:11:22,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:22,964 INFO L93 Difference]: Finished difference Result 152208 states and 248308 transitions. [2020-07-20 23:11:22,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:11:22,964 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-20 23:11:22,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:23,077 INFO L225 Difference]: With dead ends: 152208 [2020-07-20 23:11:23,077 INFO L226 Difference]: Without dead ends: 102190 [2020-07-20 23:11:23,122 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 23:11:23,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102190 states. [2020-07-20 23:11:26,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102190 to 102188. [2020-07-20 23:11:26,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102188 states. [2020-07-20 23:11:26,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102188 states to 102188 states and 165914 transitions. [2020-07-20 23:11:26,503 INFO L78 Accepts]: Start accepts. Automaton has 102188 states and 165914 transitions. Word has length 501 [2020-07-20 23:11:26,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:26,504 INFO L479 AbstractCegarLoop]: Abstraction has 102188 states and 165914 transitions. [2020-07-20 23:11:26,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:11:26,504 INFO L276 IsEmpty]: Start isEmpty. Operand 102188 states and 165914 transitions. [2020-07-20 23:11:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 23:11:26,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:26,582 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 23:11:26,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:26,787 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:26,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:26,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1935022274, now seen corresponding path program 1 times [2020-07-20 23:11:26,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:26,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903464010] [2020-07-20 23:11:26,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:27,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:27,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:27,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 1968 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:27,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:27,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:27,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:27,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903464010] [2020-07-20 23:11:27,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:27,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:27,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331008048] [2020-07-20 23:11:27,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:27,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:27,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:27,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:27,900 INFO L87 Difference]: Start difference. First operand 102188 states and 165914 transitions. Second operand 3 states. [2020-07-20 23:11:35,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:35,713 INFO L93 Difference]: Finished difference Result 297172 states and 481424 transitions. [2020-07-20 23:11:35,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:35,714 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-20 23:11:35,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:35,962 INFO L225 Difference]: With dead ends: 297172 [2020-07-20 23:11:35,962 INFO L226 Difference]: Without dead ends: 201378 [2020-07-20 23:11:36,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:36,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201378 states. [2020-07-20 23:11:46,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201378 to 201376. [2020-07-20 23:11:46,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201376 states. [2020-07-20 23:11:46,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201376 states to 201376 states and 325726 transitions. [2020-07-20 23:11:46,834 INFO L78 Accepts]: Start accepts. Automaton has 201376 states and 325726 transitions. Word has length 501 [2020-07-20 23:11:46,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:46,834 INFO L479 AbstractCegarLoop]: Abstraction has 201376 states and 325726 transitions. [2020-07-20 23:11:46,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:46,834 INFO L276 IsEmpty]: Start isEmpty. Operand 201376 states and 325726 transitions. [2020-07-20 23:11:46,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 23:11:46,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:46,971 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] [2020-07-20 23:11:47,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:47,172 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:47,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:47,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1972934273, now seen corresponding path program 1 times [2020-07-20 23:11:47,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:47,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434125744] [2020-07-20 23:11:47,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:47,583 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:11:47,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:47,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 1736 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:47,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:47,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:47,727 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:47,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434125744] [2020-07-20 23:11:47,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:47,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:47,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128672970] [2020-07-20 23:11:47,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:47,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:47,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:47,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:47,730 INFO L87 Difference]: Start difference. First operand 201376 states and 325726 transitions. Second operand 3 states. [2020-07-20 23:12:04,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:12:04,590 INFO L93 Difference]: Finished difference Result 597412 states and 965708 transitions. [2020-07-20 23:12:04,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:12:04,590 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 23:12:04,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:12:05,036 INFO L225 Difference]: With dead ends: 597412 [2020-07-20 23:12:05,036 INFO L226 Difference]: Without dead ends: 398506 [2020-07-20 23:12:05,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:12:05,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398506 states. [2020-07-20 23:12:19,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398506 to 203080. [2020-07-20 23:12:19,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203080 states. [2020-07-20 23:12:20,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203080 states to 203080 states and 328278 transitions. [2020-07-20 23:12:20,143 INFO L78 Accepts]: Start accepts. Automaton has 203080 states and 328278 transitions. Word has length 502 [2020-07-20 23:12:20,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:20,143 INFO L479 AbstractCegarLoop]: Abstraction has 203080 states and 328278 transitions. [2020-07-20 23:12:20,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:12:20,143 INFO L276 IsEmpty]: Start isEmpty. Operand 203080 states and 328278 transitions. [2020-07-20 23:12:20,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 23:12:20,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:20,284 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 23:12:20,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:20,485 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:20,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:20,486 INFO L82 PathProgramCache]: Analyzing trace with hash -172518009, now seen corresponding path program 1 times [2020-07-20 23:12:20,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:20,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076760389] [2020-07-20 23:12:20,487 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:20,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 23:12:20,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:20,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 1735 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:12:20,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:21,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:12:21,014 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:21,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076760389] [2020-07-20 23:12:21,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:21,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:12:21,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259332523] [2020-07-20 23:12:21,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:12:21,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:21,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:12:21,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:12:21,016 INFO L87 Difference]: Start difference. First operand 203080 states and 328278 transitions. Second operand 4 states. [2020-07-20 23:12:37,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:12:37,147 INFO L93 Difference]: Finished difference Result 475072 states and 771224 transitions. [2020-07-20 23:12:37,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:12:37,147 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 503 [2020-07-20 23:12:37,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:12:37,436 INFO L225 Difference]: With dead ends: 475072 [2020-07-20 23:12:37,436 INFO L226 Difference]: Without dead ends: 241662 [2020-07-20 23:12:37,615 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 23:12:37,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241662 states. [2020-07-20 23:12:47,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241662 to 241660. [2020-07-20 23:12:47,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241660 states. [2020-07-20 23:12:48,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241660 states to 241660 states and 390774 transitions. [2020-07-20 23:12:48,284 INFO L78 Accepts]: Start accepts. Automaton has 241660 states and 390774 transitions. Word has length 503 [2020-07-20 23:12:48,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:48,284 INFO L479 AbstractCegarLoop]: Abstraction has 241660 states and 390774 transitions. [2020-07-20 23:12:48,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:12:48,284 INFO L276 IsEmpty]: Start isEmpty. Operand 241660 states and 390774 transitions. [2020-07-20 23:12:49,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 23:12:49,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:49,058 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] [2020-07-20 23:12:49,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:49,259 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:49,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:49,260 INFO L82 PathProgramCache]: Analyzing trace with hash 573761889, now seen corresponding path program 1 times [2020-07-20 23:12:49,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:49,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754314520] [2020-07-20 23:12:49,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:49,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:12:49,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:49,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1973 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:12:49,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:49,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:12:49,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:49,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754314520] [2020-07-20 23:12:49,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:49,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:12:49,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678875197] [2020-07-20 23:12:49,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:12:49,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:49,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:12:49,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:12:49,951 INFO L87 Difference]: Start difference. First operand 241660 states and 390774 transitions. Second operand 3 states. [2020-07-20 23:13:11,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:13:11,716 INFO L93 Difference]: Finished difference Result 687040 states and 1107764 transitions. [2020-07-20 23:13:11,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:13:11,716 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 505 [2020-07-20 23:13:11,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:13:12,381 INFO L225 Difference]: With dead ends: 687040 [2020-07-20 23:13:12,381 INFO L226 Difference]: Without dead ends: 472734 [2020-07-20 23:13:12,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:13:12,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472734 states. [2020-07-20 23:13:44,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472734 to 472732. [2020-07-20 23:13:44,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 472732 states. [2020-07-20 23:13:45,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472732 states to 472732 states and 761410 transitions. [2020-07-20 23:13:45,600 INFO L78 Accepts]: Start accepts. Automaton has 472732 states and 761410 transitions. Word has length 505 [2020-07-20 23:13:45,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:13:45,601 INFO L479 AbstractCegarLoop]: Abstraction has 472732 states and 761410 transitions. [2020-07-20 23:13:45,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:13:45,601 INFO L276 IsEmpty]: Start isEmpty. Operand 472732 states and 761410 transitions. [2020-07-20 23:13:45,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 23:13:45,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:13:45,963 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] [2020-07-20 23:13:46,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:46,165 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:13:46,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:13:46,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1225960998, now seen corresponding path program 1 times [2020-07-20 23:13:46,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:13:46,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495428905] [2020-07-20 23:13:46,166 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:46,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:13:46,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:13:46,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1481 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:13:46,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:13:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:13:47,521 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:13:47,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495428905] [2020-07-20 23:13:47,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:13:47,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:13:47,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858960907] [2020-07-20 23:13:47,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:13:47,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:13:47,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:13:47,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:13:47,524 INFO L87 Difference]: Start difference. First operand 472732 states and 761410 transitions. Second operand 3 states. [2020-07-20 23:14:34,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:14:34,394 INFO L93 Difference]: Finished difference Result 1402624 states and 2257812 transitions. [2020-07-20 23:14:34,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:14:34,394 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 505 [2020-07-20 23:14:34,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:14:35,797 INFO L225 Difference]: With dead ends: 1402624 [2020-07-20 23:14:35,798 INFO L226 Difference]: Without dead ends: 937670 [2020-07-20 23:14:36,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:14:36,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 937670 states. [2020-07-20 23:15:25,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 937670 to 476932. [2020-07-20 23:15:25,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 476932 states. [2020-07-20 23:15:26,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476932 states to 476932 states and 766870 transitions. [2020-07-20 23:15:26,388 INFO L78 Accepts]: Start accepts. Automaton has 476932 states and 766870 transitions. Word has length 505 [2020-07-20 23:15:26,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:15:26,389 INFO L479 AbstractCegarLoop]: Abstraction has 476932 states and 766870 transitions. [2020-07-20 23:15:26,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:15:26,389 INFO L276 IsEmpty]: Start isEmpty. Operand 476932 states and 766870 transitions. [2020-07-20 23:15:26,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 23:15:26,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:15:26,809 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] [2020-07-20 23:15:27,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:27,010 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:15:27,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:15:27,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1074986141, now seen corresponding path program 1 times [2020-07-20 23:15:27,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:15:27,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93540426] [2020-07-20 23:15:27,013 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:28,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:15:28,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:15:28,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 1496 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 23:15:28,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:15:28,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:15:28,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:15:28,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93540426] [2020-07-20 23:15:28,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:15:28,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 23:15:28,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015236425] [2020-07-20 23:15:28,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 23:15:28,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:15:28,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 23:15:28,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 23:15:28,421 INFO L87 Difference]: Start difference. First operand 476932 states and 766870 transitions. Second operand 9 states. [2020-07-20 23:18:24,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:18:24,387 INFO L93 Difference]: Finished difference Result 2419406 states and 3867923 transitions. [2020-07-20 23:18:24,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 23:18:24,388 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 505 [2020-07-20 23:18:24,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:18:28,471 INFO L225 Difference]: With dead ends: 2419406 [2020-07-20 23:18:28,472 INFO L226 Difference]: Without dead ends: 2337980 [2020-07-20 23:18:29,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=347, Invalid=985, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 23:18:31,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337980 states.