/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 21:05:05,935 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 21:05:05,938 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 21:05:05,955 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 21:05:05,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 21:05:05,957 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 21:05:05,959 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 21:05:05,972 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 21:05:05,974 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 21:05:05,975 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 21:05:05,977 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 21:05:05,978 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 21:05:05,978 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 21:05:05,981 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 21:05:05,983 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 21:05:05,985 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 21:05:05,988 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 21:05:05,988 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 21:05:05,990 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 21:05:05,996 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 21:05:05,998 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 21:05:06,001 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 21:05:06,004 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 21:05:06,005 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 21:05:06,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 21:05:06,008 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 21:05:06,008 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 21:05:06,010 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 21:05:06,011 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 21:05:06,012 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 21:05:06,012 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 21:05:06,013 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 21:05:06,014 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 21:05:06,014 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 21:05:06,016 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 21:05:06,016 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 21:05:06,017 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 21:05:06,017 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 21:05:06,017 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 21:05:06,018 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 21:05:06,019 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 21:05:06,020 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 21:05:06,041 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 21:05:06,041 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 21:05:06,043 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 21:05:06,043 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 21:05:06,043 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 21:05:06,043 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 21:05:06,043 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 21:05:06,044 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 21:05:06,044 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 21:05:06,044 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 21:05:06,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 21:05:06,045 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 21:05:06,045 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 21:05:06,045 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 21:05:06,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 21:05:06,045 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 21:05:06,046 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 21:05:06,046 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 21:05:06,046 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 21:05:06,046 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 21:05:06,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 21:05:06,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:05:06,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 21:05:06,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 21:05:06,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 21:05:06,047 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 21:05:06,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:06,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 21:05:06,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 21:05:06,048 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 -> 2 [2020-07-21 21:05:06,349 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 21:05:06,361 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 21:05:06,364 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 21:05:06,366 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 21:05:06,366 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 21:05:06,367 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-21 21:05:06,425 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a55901e7f/4ca43916a5f945d7ae1d6ea7f8c42d5b/FLAG8d081beb9 [2020-07-21 21:05:07,014 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 21:05:07,015 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-21 21:05:07,034 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a55901e7f/4ca43916a5f945d7ae1d6ea7f8c42d5b/FLAG8d081beb9 [2020-07-21 21:05:07,216 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a55901e7f/4ca43916a5f945d7ae1d6ea7f8c42d5b [2020-07-21 21:05:07,224 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 21:05:07,227 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 21:05:07,228 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 21:05:07,228 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 21:05:07,232 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 21:05:07,233 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:05:07" (1/1) ... [2020-07-21 21:05:07,235 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1458a692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:07, skipping insertion in model container [2020-07-21 21:05:07,236 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:05:07" (1/1) ... [2020-07-21 21:05:07,243 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 21:05:07,346 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 21:05:08,421 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:05:08,438 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 21:05:08,846 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:05:08,867 INFO L208 MainTranslator]: Completed translation [2020-07-21 21:05:08,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08 WrapperNode [2020-07-21 21:05:08,868 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 21:05:08,868 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 21:05:08,869 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 21:05:08,869 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 21:05:08,881 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:08,882 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:08,909 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:08,909 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:08,967 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:09,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:09,034 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... [2020-07-21 21:05:09,061 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 21:05:09,063 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 21:05:09,063 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 21:05:09,063 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 21:05:09,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:05:09,160 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 21:05:09,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 21:05:09,161 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 21:05:09,161 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 21:05:09,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 21:05:09,164 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 21:05:09,164 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 21:05:09,164 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 21:05:09,164 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 21:05:09,165 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 21:05:09,166 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 21:05:09,166 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 21:05:09,166 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 21:05:09,167 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 21:05:09,167 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 21:05:09,168 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 21:05:09,168 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 21:05:09,169 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 21:05:09,169 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 21:05:09,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 21:05:09,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 21:05:11,891 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 21:05:11,891 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 21:05:11,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:05:11 BoogieIcfgContainer [2020-07-21 21:05:11,900 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 21:05:11,901 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 21:05:11,902 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 21:05:11,905 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 21:05:11,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 09:05:07" (1/3) ... [2020-07-21 21:05:11,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92fe029 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:05:11, skipping insertion in model container [2020-07-21 21:05:11,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:05:08" (2/3) ... [2020-07-21 21:05:11,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92fe029 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:05:11, skipping insertion in model container [2020-07-21 21:05:11,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:05:11" (3/3) ... [2020-07-21 21:05:11,908 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-21 21:05:11,918 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 21:05:11,926 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 21:05:11,940 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 21:05:11,967 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 21:05:11,967 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 21:05:11,967 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 21:05:11,967 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 21:05:11,967 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 21:05:11,968 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 21:05:11,968 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 21:05:11,968 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 21:05:11,999 INFO L276 IsEmpty]: Start isEmpty. Operand 795 states. [2020-07-21 21:05:12,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 21:05:12,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:12,028 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:12,029 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:12,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:12,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2046950044, now seen corresponding path program 1 times [2020-07-21 21:05:12,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:12,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405293923] [2020-07-21 21:05:12,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:12,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:12,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:12,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 1154 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:05:12,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:12,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:12,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:12,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405293923] [2020-07-21 21:05:12,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:12,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:12,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438559146] [2020-07-21 21:05:12,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:12,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:12,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:12,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:12,922 INFO L87 Difference]: Start difference. First operand 795 states. Second operand 4 states. [2020-07-21 21:05:13,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:13,214 INFO L93 Difference]: Finished difference Result 2328 states and 4137 transitions. [2020-07-21 21:05:13,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 21:05:13,216 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 324 [2020-07-21 21:05:13,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:13,242 INFO L225 Difference]: With dead ends: 2328 [2020-07-21 21:05:13,242 INFO L226 Difference]: Without dead ends: 1542 [2020-07-21 21:05:13,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:05:13,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2020-07-21 21:05:13,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1540. [2020-07-21 21:05:13,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1540 states. [2020-07-21 21:05:13,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1540 states to 1540 states and 2395 transitions. [2020-07-21 21:05:13,382 INFO L78 Accepts]: Start accepts. Automaton has 1540 states and 2395 transitions. Word has length 324 [2020-07-21 21:05:13,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:13,383 INFO L479 AbstractCegarLoop]: Abstraction has 1540 states and 2395 transitions. [2020-07-21 21:05:13,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:05:13,383 INFO L276 IsEmpty]: Start isEmpty. Operand 1540 states and 2395 transitions. [2020-07-21 21:05:13,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 21:05:13,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:13,393 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:13,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:13,607 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:13,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:13,608 INFO L82 PathProgramCache]: Analyzing trace with hash 559759921, now seen corresponding path program 1 times [2020-07-21 21:05:13,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:13,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249258481] [2020-07-21 21:05:13,610 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:13,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:13,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:13,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 1156 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:14,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:14,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:14,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:14,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249258481] [2020-07-21 21:05:14,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:14,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:14,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095634931] [2020-07-21 21:05:14,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:14,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:14,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:14,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:14,138 INFO L87 Difference]: Start difference. First operand 1540 states and 2395 transitions. Second operand 3 states. [2020-07-21 21:05:14,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:14,352 INFO L93 Difference]: Finished difference Result 4422 states and 6847 transitions. [2020-07-21 21:05:14,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:14,353 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 21:05:14,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:14,371 INFO L225 Difference]: With dead ends: 4422 [2020-07-21 21:05:14,371 INFO L226 Difference]: Without dead ends: 2984 [2020-07-21 21:05:14,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:14,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2984 states. [2020-07-21 21:05:14,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2984 to 2982. [2020-07-21 21:05:14,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2982 states. [2020-07-21 21:05:14,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2982 states to 2982 states and 4607 transitions. [2020-07-21 21:05:14,573 INFO L78 Accepts]: Start accepts. Automaton has 2982 states and 4607 transitions. Word has length 326 [2020-07-21 21:05:14,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:14,574 INFO L479 AbstractCegarLoop]: Abstraction has 2982 states and 4607 transitions. [2020-07-21 21:05:14,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:14,574 INFO L276 IsEmpty]: Start isEmpty. Operand 2982 states and 4607 transitions. [2020-07-21 21:05:14,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 21:05:14,585 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:14,585 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:14,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:14,799 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:14,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:14,800 INFO L82 PathProgramCache]: Analyzing trace with hash 59250742, now seen corresponding path program 1 times [2020-07-21 21:05:14,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:14,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671211920] [2020-07-21 21:05:14,801 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:15,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:15,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:15,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:15,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:15,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:15,239 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:15,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671211920] [2020-07-21 21:05:15,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:15,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:15,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718878608] [2020-07-21 21:05:15,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:15,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:15,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:15,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:15,243 INFO L87 Difference]: Start difference. First operand 2982 states and 4607 transitions. Second operand 3 states. [2020-07-21 21:05:15,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:15,434 INFO L93 Difference]: Finished difference Result 8914 states and 13772 transitions. [2020-07-21 21:05:15,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:15,435 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 21:05:15,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:15,463 INFO L225 Difference]: With dead ends: 8914 [2020-07-21 21:05:15,464 INFO L226 Difference]: Without dead ends: 5947 [2020-07-21 21:05:15,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:15,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5947 states. [2020-07-21 21:05:15,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5947 to 2993. [2020-07-21 21:05:15,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2993 states. [2020-07-21 21:05:15,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2993 states to 2993 states and 4623 transitions. [2020-07-21 21:05:15,621 INFO L78 Accepts]: Start accepts. Automaton has 2993 states and 4623 transitions. Word has length 326 [2020-07-21 21:05:15,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:15,621 INFO L479 AbstractCegarLoop]: Abstraction has 2993 states and 4623 transitions. [2020-07-21 21:05:15,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:15,622 INFO L276 IsEmpty]: Start isEmpty. Operand 2993 states and 4623 transitions. [2020-07-21 21:05:15,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 21:05:15,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:15,632 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:15,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:15,846 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:15,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:15,847 INFO L82 PathProgramCache]: Analyzing trace with hash -882201744, now seen corresponding path program 1 times [2020-07-21 21:05:15,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:15,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710138155] [2020-07-21 21:05:15,849 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:16,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:16,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:16,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:16,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:16,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:16,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:16,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710138155] [2020-07-21 21:05:16,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:16,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:16,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926431338] [2020-07-21 21:05:16,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:16,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:16,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:16,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:16,276 INFO L87 Difference]: Start difference. First operand 2993 states and 4623 transitions. Second operand 3 states. [2020-07-21 21:05:16,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:16,513 INFO L93 Difference]: Finished difference Result 8871 states and 13690 transitions. [2020-07-21 21:05:16,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:16,514 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 327 [2020-07-21 21:05:16,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:16,542 INFO L225 Difference]: With dead ends: 8871 [2020-07-21 21:05:16,542 INFO L226 Difference]: Without dead ends: 5908 [2020-07-21 21:05:16,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:16,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5908 states. [2020-07-21 21:05:16,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5908 to 3003. [2020-07-21 21:05:16,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3003 states. [2020-07-21 21:05:16,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3003 states to 3003 states and 4637 transitions. [2020-07-21 21:05:16,729 INFO L78 Accepts]: Start accepts. Automaton has 3003 states and 4637 transitions. Word has length 327 [2020-07-21 21:05:16,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:16,729 INFO L479 AbstractCegarLoop]: Abstraction has 3003 states and 4637 transitions. [2020-07-21 21:05:16,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:16,730 INFO L276 IsEmpty]: Start isEmpty. Operand 3003 states and 4637 transitions. [2020-07-21 21:05:16,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-21 21:05:16,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:16,740 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] [2020-07-21 21:05:16,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:16,955 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:16,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:16,956 INFO L82 PathProgramCache]: Analyzing trace with hash -2128959444, now seen corresponding path program 1 times [2020-07-21 21:05:16,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:16,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140945348] [2020-07-21 21:05:16,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:17,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:17,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:17,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:17,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:17,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:17,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:17,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140945348] [2020-07-21 21:05:17,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:17,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:17,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747949760] [2020-07-21 21:05:17,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:17,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:17,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:17,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:17,409 INFO L87 Difference]: Start difference. First operand 3003 states and 4637 transitions. Second operand 3 states. [2020-07-21 21:05:17,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:17,655 INFO L93 Difference]: Finished difference Result 8613 states and 13241 transitions. [2020-07-21 21:05:17,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:17,656 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 328 [2020-07-21 21:05:17,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:17,683 INFO L225 Difference]: With dead ends: 8613 [2020-07-21 21:05:17,684 INFO L226 Difference]: Without dead ends: 5805 [2020-07-21 21:05:17,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:17,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5805 states. [2020-07-21 21:05:17,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5805 to 5803. [2020-07-21 21:05:17,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5803 states. [2020-07-21 21:05:18,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5803 states to 5803 states and 8898 transitions. [2020-07-21 21:05:18,005 INFO L78 Accepts]: Start accepts. Automaton has 5803 states and 8898 transitions. Word has length 328 [2020-07-21 21:05:18,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:18,006 INFO L479 AbstractCegarLoop]: Abstraction has 5803 states and 8898 transitions. [2020-07-21 21:05:18,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:18,007 INFO L276 IsEmpty]: Start isEmpty. Operand 5803 states and 8898 transitions. [2020-07-21 21:05:18,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-21 21:05:18,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:18,029 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] [2020-07-21 21:05:18,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:18,243 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:18,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:18,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1426305655, now seen corresponding path program 1 times [2020-07-21 21:05:18,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:18,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595787975] [2020-07-21 21:05:18,245 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:18,618 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:18,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:18,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:05:18,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:18,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:18,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:18,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595787975] [2020-07-21 21:05:18,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:18,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:18,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749012654] [2020-07-21 21:05:18,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:18,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:18,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:18,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:18,719 INFO L87 Difference]: Start difference. First operand 5803 states and 8898 transitions. Second operand 4 states. [2020-07-21 21:05:19,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:19,086 INFO L93 Difference]: Finished difference Result 16042 states and 24430 transitions. [2020-07-21 21:05:19,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:05:19,087 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 328 [2020-07-21 21:05:19,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:19,137 INFO L225 Difference]: With dead ends: 16042 [2020-07-21 21:05:19,137 INFO L226 Difference]: Without dead ends: 10685 [2020-07-21 21:05:19,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:05:19,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10685 states. [2020-07-21 21:05:19,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10685 to 6017. [2020-07-21 21:05:19,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6017 states. [2020-07-21 21:05:19,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6017 states to 6017 states and 9262 transitions. [2020-07-21 21:05:19,478 INFO L78 Accepts]: Start accepts. Automaton has 6017 states and 9262 transitions. Word has length 328 [2020-07-21 21:05:19,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:19,478 INFO L479 AbstractCegarLoop]: Abstraction has 6017 states and 9262 transitions. [2020-07-21 21:05:19,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:05:19,479 INFO L276 IsEmpty]: Start isEmpty. Operand 6017 states and 9262 transitions. [2020-07-21 21:05:19,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 21:05:19,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:19,497 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] [2020-07-21 21:05:19,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:19,711 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:19,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:19,711 INFO L82 PathProgramCache]: Analyzing trace with hash 730242313, now seen corresponding path program 1 times [2020-07-21 21:05:19,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:19,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36043066] [2020-07-21 21:05:19,712 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:20,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:20,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:20,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1170 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:20,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:20,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:20,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:20,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36043066] [2020-07-21 21:05:20,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:20,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:20,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517563360] [2020-07-21 21:05:20,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:20,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:20,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:20,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:20,073 INFO L87 Difference]: Start difference. First operand 6017 states and 9262 transitions. Second operand 3 states. [2020-07-21 21:05:20,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:20,458 INFO L93 Difference]: Finished difference Result 12717 states and 19608 transitions. [2020-07-21 21:05:20,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:20,459 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-21 21:05:20,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:20,481 INFO L225 Difference]: With dead ends: 12717 [2020-07-21 21:05:20,481 INFO L226 Difference]: Without dead ends: 8339 [2020-07-21 21:05:20,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:20,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8339 states. [2020-07-21 21:05:20,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8339 to 7001. [2020-07-21 21:05:20,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7001 states. [2020-07-21 21:05:20,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7001 states to 7001 states and 10870 transitions. [2020-07-21 21:05:20,823 INFO L78 Accepts]: Start accepts. Automaton has 7001 states and 10870 transitions. Word has length 330 [2020-07-21 21:05:20,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:20,823 INFO L479 AbstractCegarLoop]: Abstraction has 7001 states and 10870 transitions. [2020-07-21 21:05:20,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:20,823 INFO L276 IsEmpty]: Start isEmpty. Operand 7001 states and 10870 transitions. [2020-07-21 21:05:20,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 21:05:20,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:20,834 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] [2020-07-21 21:05:21,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:21,049 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:21,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:21,050 INFO L82 PathProgramCache]: Analyzing trace with hash 858352887, now seen corresponding path program 1 times [2020-07-21 21:05:21,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:21,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619402724] [2020-07-21 21:05:21,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:21,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:21,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:21,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 1161 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:21,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:21,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:21,428 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:21,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619402724] [2020-07-21 21:05:21,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:21,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:21,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940145929] [2020-07-21 21:05:21,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:21,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:21,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:21,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:21,430 INFO L87 Difference]: Start difference. First operand 7001 states and 10870 transitions. Second operand 3 states. [2020-07-21 21:05:21,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:21,902 INFO L93 Difference]: Finished difference Result 19711 states and 30314 transitions. [2020-07-21 21:05:21,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:21,903 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-21 21:05:21,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:21,933 INFO L225 Difference]: With dead ends: 19711 [2020-07-21 21:05:21,933 INFO L226 Difference]: Without dead ends: 13352 [2020-07-21 21:05:21,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:21,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13352 states. [2020-07-21 21:05:22,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13352 to 7098. [2020-07-21 21:05:22,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7098 states. [2020-07-21 21:05:22,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7098 states to 7098 states and 11000 transitions. [2020-07-21 21:05:22,302 INFO L78 Accepts]: Start accepts. Automaton has 7098 states and 11000 transitions. Word has length 330 [2020-07-21 21:05:22,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:22,303 INFO L479 AbstractCegarLoop]: Abstraction has 7098 states and 11000 transitions. [2020-07-21 21:05:22,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:22,303 INFO L276 IsEmpty]: Start isEmpty. Operand 7098 states and 11000 transitions. [2020-07-21 21:05:22,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2020-07-21 21:05:22,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:22,314 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] [2020-07-21 21:05:22,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:22,527 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:22,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:22,527 INFO L82 PathProgramCache]: Analyzing trace with hash 903222164, now seen corresponding path program 1 times [2020-07-21 21:05:22,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:22,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104991352] [2020-07-21 21:05:22,528 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:22,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:22,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:22,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:22,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:22,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:22,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104991352] [2020-07-21 21:05:22,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:22,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:22,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202539934] [2020-07-21 21:05:22,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:22,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:22,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:22,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:22,909 INFO L87 Difference]: Start difference. First operand 7098 states and 11000 transitions. Second operand 3 states. [2020-07-21 21:05:23,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:23,373 INFO L93 Difference]: Finished difference Result 19834 states and 30465 transitions. [2020-07-21 21:05:23,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:23,373 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 331 [2020-07-21 21:05:23,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:23,396 INFO L225 Difference]: With dead ends: 19834 [2020-07-21 21:05:23,396 INFO L226 Difference]: Without dead ends: 13495 [2020-07-21 21:05:23,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:23,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13495 states. [2020-07-21 21:05:23,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13495 to 7215. [2020-07-21 21:05:23,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7215 states. [2020-07-21 21:05:23,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7215 states to 7215 states and 11155 transitions. [2020-07-21 21:05:23,773 INFO L78 Accepts]: Start accepts. Automaton has 7215 states and 11155 transitions. Word has length 331 [2020-07-21 21:05:23,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:23,773 INFO L479 AbstractCegarLoop]: Abstraction has 7215 states and 11155 transitions. [2020-07-21 21:05:23,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:23,774 INFO L276 IsEmpty]: Start isEmpty. Operand 7215 states and 11155 transitions. [2020-07-21 21:05:23,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 21:05:23,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:23,784 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] [2020-07-21 21:05:23,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:23,999 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:23,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:24,000 INFO L82 PathProgramCache]: Analyzing trace with hash 960357788, now seen corresponding path program 1 times [2020-07-21 21:05:24,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:24,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212918797] [2020-07-21 21:05:24,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:24,309 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:24,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:24,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 1174 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 21:05:24,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:24,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:24,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212918797] [2020-07-21 21:05:24,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:24,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 21:05:24,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248544871] [2020-07-21 21:05:24,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 21:05:24,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:24,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 21:05:24,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 21:05:24,490 INFO L87 Difference]: Start difference. First operand 7215 states and 11155 transitions. Second operand 9 states. [2020-07-21 21:05:30,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:30,936 INFO L93 Difference]: Finished difference Result 47594 states and 75108 transitions. [2020-07-21 21:05:30,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 21:05:30,936 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 332 [2020-07-21 21:05:30,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:30,978 INFO L225 Difference]: With dead ends: 47594 [2020-07-21 21:05:30,978 INFO L226 Difference]: Without dead ends: 45888 [2020-07-21 21:05:30,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 21:05:31,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45888 states. [2020-07-21 21:05:32,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45888 to 17943. [2020-07-21 21:05:32,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17943 states. [2020-07-21 21:05:32,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17943 states to 17943 states and 28113 transitions. [2020-07-21 21:05:32,159 INFO L78 Accepts]: Start accepts. Automaton has 17943 states and 28113 transitions. Word has length 332 [2020-07-21 21:05:32,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:32,159 INFO L479 AbstractCegarLoop]: Abstraction has 17943 states and 28113 transitions. [2020-07-21 21:05:32,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 21:05:32,160 INFO L276 IsEmpty]: Start isEmpty. Operand 17943 states and 28113 transitions. [2020-07-21 21:05:32,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 21:05:32,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:32,172 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] [2020-07-21 21:05:32,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:32,374 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:32,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:32,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1837398990, now seen corresponding path program 1 times [2020-07-21 21:05:32,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:32,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017132778] [2020-07-21 21:05:32,376 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:32,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:32,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:32,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 1171 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:32,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:32,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:32,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017132778] [2020-07-21 21:05:32,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:32,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:32,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524960401] [2020-07-21 21:05:32,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:32,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:32,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:32,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:32,769 INFO L87 Difference]: Start difference. First operand 17943 states and 28113 transitions. Second operand 3 states. [2020-07-21 21:05:34,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:34,302 INFO L93 Difference]: Finished difference Result 41459 states and 65529 transitions. [2020-07-21 21:05:34,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:34,303 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-21 21:05:34,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:34,340 INFO L225 Difference]: With dead ends: 41459 [2020-07-21 21:05:34,340 INFO L226 Difference]: Without dead ends: 25517 [2020-07-21 21:05:34,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:34,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25517 states. [2020-07-21 21:05:35,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25517 to 23197. [2020-07-21 21:05:35,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23197 states. [2020-07-21 21:05:35,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23197 states to 23197 states and 36735 transitions. [2020-07-21 21:05:35,511 INFO L78 Accepts]: Start accepts. Automaton has 23197 states and 36735 transitions. Word has length 332 [2020-07-21 21:05:35,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:35,511 INFO L479 AbstractCegarLoop]: Abstraction has 23197 states and 36735 transitions. [2020-07-21 21:05:35,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:35,511 INFO L276 IsEmpty]: Start isEmpty. Operand 23197 states and 36735 transitions. [2020-07-21 21:05:35,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 21:05:35,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:35,524 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] [2020-07-21 21:05:35,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:35,725 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:35,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:35,726 INFO L82 PathProgramCache]: Analyzing trace with hash 757713930, now seen corresponding path program 1 times [2020-07-21 21:05:35,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:35,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026427263] [2020-07-21 21:05:35,727 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:36,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:36,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:36,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1161 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:05:36,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:36,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:36,125 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:36,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026427263] [2020-07-21 21:05:36,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:36,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:36,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962851900] [2020-07-21 21:05:36,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:36,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:36,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:36,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:36,128 INFO L87 Difference]: Start difference. First operand 23197 states and 36735 transitions. Second operand 4 states. [2020-07-21 21:05:37,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:37,319 INFO L93 Difference]: Finished difference Result 43182 states and 68276 transitions. [2020-07-21 21:05:37,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:05:37,319 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-07-21 21:05:37,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:37,348 INFO L225 Difference]: With dead ends: 43182 [2020-07-21 21:05:37,348 INFO L226 Difference]: Without dead ends: 20950 [2020-07-21 21:05:37,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:05:37,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20950 states. [2020-07-21 21:05:39,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20950 to 20876. [2020-07-21 21:05:39,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20876 states. [2020-07-21 21:05:39,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20876 states to 20876 states and 33035 transitions. [2020-07-21 21:05:39,128 INFO L78 Accepts]: Start accepts. Automaton has 20876 states and 33035 transitions. Word has length 332 [2020-07-21 21:05:39,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:39,128 INFO L479 AbstractCegarLoop]: Abstraction has 20876 states and 33035 transitions. [2020-07-21 21:05:39,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:05:39,128 INFO L276 IsEmpty]: Start isEmpty. Operand 20876 states and 33035 transitions. [2020-07-21 21:05:39,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-21 21:05:39,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:39,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:05:39,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:39,341 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:39,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:39,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1945945451, now seen corresponding path program 1 times [2020-07-21 21:05:39,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:39,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047695130] [2020-07-21 21:05:39,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:39,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:39,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:39,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:05:39,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:39,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:39,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:39,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047695130] [2020-07-21 21:05:39,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:39,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:05:39,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135058119] [2020-07-21 21:05:39,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:05:39,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:39,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:05:39,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:05:39,772 INFO L87 Difference]: Start difference. First operand 20876 states and 33035 transitions. Second operand 4 states. [2020-07-21 21:05:41,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:41,504 INFO L93 Difference]: Finished difference Result 61639 states and 97473 transitions. [2020-07-21 21:05:41,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:05:41,504 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 333 [2020-07-21 21:05:41,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:41,559 INFO L225 Difference]: With dead ends: 61639 [2020-07-21 21:05:41,559 INFO L226 Difference]: Without dead ends: 40976 [2020-07-21 21:05:41,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:05:41,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40976 states. [2020-07-21 21:05:43,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40976 to 40974. [2020-07-21 21:05:43,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40974 states. [2020-07-21 21:05:43,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40974 states to 40974 states and 64533 transitions. [2020-07-21 21:05:43,539 INFO L78 Accepts]: Start accepts. Automaton has 40974 states and 64533 transitions. Word has length 333 [2020-07-21 21:05:43,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:43,540 INFO L479 AbstractCegarLoop]: Abstraction has 40974 states and 64533 transitions. [2020-07-21 21:05:43,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:05:43,540 INFO L276 IsEmpty]: Start isEmpty. Operand 40974 states and 64533 transitions. [2020-07-21 21:05:43,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 21:05:43,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:43,554 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] [2020-07-21 21:05:43,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:43,760 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:43,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:43,761 INFO L82 PathProgramCache]: Analyzing trace with hash 254132386, now seen corresponding path program 1 times [2020-07-21 21:05:43,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:43,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425627886] [2020-07-21 21:05:43,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:44,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:44,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:44,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 1174 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:44,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:44,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:44,159 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:44,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425627886] [2020-07-21 21:05:44,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:44,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:44,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299031990] [2020-07-21 21:05:44,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:44,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:44,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:44,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:44,160 INFO L87 Difference]: Start difference. First operand 40974 states and 64533 transitions. Second operand 3 states. [2020-07-21 21:05:48,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:48,582 INFO L93 Difference]: Finished difference Result 120016 states and 188732 transitions. [2020-07-21 21:05:48,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:48,582 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 335 [2020-07-21 21:05:48,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:48,665 INFO L225 Difference]: With dead ends: 120016 [2020-07-21 21:05:48,665 INFO L226 Difference]: Without dead ends: 79820 [2020-07-21 21:05:48,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:48,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79820 states. [2020-07-21 21:05:52,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79820 to 79818. [2020-07-21 21:05:52,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79818 states. [2020-07-21 21:05:52,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79818 states to 79818 states and 124923 transitions. [2020-07-21 21:05:52,524 INFO L78 Accepts]: Start accepts. Automaton has 79818 states and 124923 transitions. Word has length 335 [2020-07-21 21:05:52,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:52,524 INFO L479 AbstractCegarLoop]: Abstraction has 79818 states and 124923 transitions. [2020-07-21 21:05:52,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:52,524 INFO L276 IsEmpty]: Start isEmpty. Operand 79818 states and 124923 transitions. [2020-07-21 21:05:52,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 21:05:52,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:52,555 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] [2020-07-21 21:05:52,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:52,768 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:52,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:52,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1360763581, now seen corresponding path program 1 times [2020-07-21 21:05:52,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:52,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489185328] [2020-07-21 21:05:52,770 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:53,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:53,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:53,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 1176 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:53,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:53,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:05:53,148 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:53,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489185328] [2020-07-21 21:05:53,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:53,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:53,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591539274] [2020-07-21 21:05:53,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:53,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:53,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:53,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:53,150 INFO L87 Difference]: Start difference. First operand 79818 states and 124923 transitions. Second operand 3 states. [2020-07-21 21:05:59,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:59,022 INFO L93 Difference]: Finished difference Result 158952 states and 248141 transitions. [2020-07-21 21:05:59,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:59,023 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 335 [2020-07-21 21:05:59,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:59,145 INFO L225 Difference]: With dead ends: 158952 [2020-07-21 21:05:59,145 INFO L226 Difference]: Without dead ends: 114800 [2020-07-21 21:05:59,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:59,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114800 states. [2020-07-21 21:06:03,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114800 to 79822. [2020-07-21 21:06:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79822 states. [2020-07-21 21:06:03,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79822 states to 79822 states and 124925 transitions. [2020-07-21 21:06:03,510 INFO L78 Accepts]: Start accepts. Automaton has 79822 states and 124925 transitions. Word has length 335 [2020-07-21 21:06:03,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:06:03,511 INFO L479 AbstractCegarLoop]: Abstraction has 79822 states and 124925 transitions. [2020-07-21 21:06:03,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:06:03,511 INFO L276 IsEmpty]: Start isEmpty. Operand 79822 states and 124925 transitions. [2020-07-21 21:06:03,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 21:06:03,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:06:03,550 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] [2020-07-21 21:06:03,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:03,762 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:06:03,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:06:03,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1718375350, now seen corresponding path program 1 times [2020-07-21 21:06:03,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:06:03,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923048837] [2020-07-21 21:06:03,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:04,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:06:04,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:06:04,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 1179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 21:06:04,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:06:04,192 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:06:04,192 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:06:04,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923048837] [2020-07-21 21:06:04,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:06:04,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 21:06:04,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041645605] [2020-07-21 21:06:04,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 21:06:04,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:06:04,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 21:06:04,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 21:06:04,194 INFO L87 Difference]: Start difference. First operand 79822 states and 124925 transitions. Second operand 9 states. [2020-07-21 21:06:28,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:06:28,091 INFO L93 Difference]: Finished difference Result 390306 states and 615667 transitions. [2020-07-21 21:06:28,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 21:06:28,092 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 335 [2020-07-21 21:06:28,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:06:28,563 INFO L225 Difference]: With dead ends: 390306 [2020-07-21 21:06:28,563 INFO L226 Difference]: Without dead ends: 356652 [2020-07-21 21:06:28,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=352, Invalid=1054, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 21:06:28,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356652 states. [2020-07-21 21:06:46,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356652 to 190434. [2020-07-21 21:06:46,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190434 states. [2020-07-21 21:06:46,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190434 states to 190434 states and 299555 transitions. [2020-07-21 21:06:46,535 INFO L78 Accepts]: Start accepts. Automaton has 190434 states and 299555 transitions. Word has length 335 [2020-07-21 21:06:46,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:06:46,535 INFO L479 AbstractCegarLoop]: Abstraction has 190434 states and 299555 transitions. [2020-07-21 21:06:46,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 21:06:46,535 INFO L276 IsEmpty]: Start isEmpty. Operand 190434 states and 299555 transitions. [2020-07-21 21:06:46,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 21:06:46,585 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:06:46,585 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] [2020-07-21 21:06:46,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:46,799 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:06:46,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:06:46,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1489812399, now seen corresponding path program 1 times [2020-07-21 21:06:46,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:06:46,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775754375] [2020-07-21 21:06:46,801 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:06:47,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:06:47,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:06:47,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:06:47,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:06:47,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:06:47,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:06:47,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775754375] [2020-07-21 21:06:47,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:06:47,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:06:47,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787662707] [2020-07-21 21:06:47,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:06:47,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:06:47,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:06:47,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:06:47,186 INFO L87 Difference]: Start difference. First operand 190434 states and 299555 transitions. Second operand 3 states. [2020-07-21 21:07:12,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:07:12,342 INFO L93 Difference]: Finished difference Result 569472 states and 895515 transitions. [2020-07-21 21:07:12,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:07:12,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 335 [2020-07-21 21:07:12,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:07:12,833 INFO L225 Difference]: With dead ends: 569472 [2020-07-21 21:07:12,833 INFO L226 Difference]: Without dead ends: 379820 [2020-07-21 21:07:12,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:07:13,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379820 states. [2020-07-21 21:07:27,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379820 to 190434. [2020-07-21 21:07:27,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190434 states. [2020-07-21 21:07:27,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190434 states to 190434 states and 299551 transitions. [2020-07-21 21:07:27,494 INFO L78 Accepts]: Start accepts. Automaton has 190434 states and 299551 transitions. Word has length 335 [2020-07-21 21:07:27,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:07:27,494 INFO L479 AbstractCegarLoop]: Abstraction has 190434 states and 299551 transitions. [2020-07-21 21:07:27,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:07:27,494 INFO L276 IsEmpty]: Start isEmpty. Operand 190434 states and 299551 transitions. [2020-07-21 21:07:27,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-21 21:07:27,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:07:27,541 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] [2020-07-21 21:07:27,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:07:27,742 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:07:27,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:07:27,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1934530709, now seen corresponding path program 1 times [2020-07-21 21:07:27,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:07:27,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098425045] [2020-07-21 21:07:27,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:07:28,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:07:28,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:07:28,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 1172 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:07:28,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:07:28,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:07:28,106 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:07:28,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098425045] [2020-07-21 21:07:28,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:07:28,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:07:28,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560674624] [2020-07-21 21:07:28,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:07:28,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:07:28,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:07:28,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:07:28,108 INFO L87 Difference]: Start difference. First operand 190434 states and 299551 transitions. Second operand 4 states. [2020-07-21 21:07:52,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:07:52,532 INFO L93 Difference]: Finished difference Result 535821 states and 841815 transitions. [2020-07-21 21:07:52,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:07:52,533 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 336 [2020-07-21 21:07:52,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:07:53,011 INFO L225 Difference]: With dead ends: 535821 [2020-07-21 21:07:53,011 INFO L226 Difference]: Without dead ends: 348035 [2020-07-21 21:07:53,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:07:53,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348035 states. [2020-07-21 21:08:12,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348035 to 186538. [2020-07-21 21:08:12,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186538 states. [2020-07-21 21:08:12,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186538 states to 186538 states and 293311 transitions. [2020-07-21 21:08:12,548 INFO L78 Accepts]: Start accepts. Automaton has 186538 states and 293311 transitions. Word has length 336 [2020-07-21 21:08:12,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:12,548 INFO L479 AbstractCegarLoop]: Abstraction has 186538 states and 293311 transitions. [2020-07-21 21:08:12,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:12,548 INFO L276 IsEmpty]: Start isEmpty. Operand 186538 states and 293311 transitions. [2020-07-21 21:08:12,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-21 21:08:12,597 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:12,598 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] [2020-07-21 21:08:12,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:12,810 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:12,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:12,811 INFO L82 PathProgramCache]: Analyzing trace with hash 689658759, now seen corresponding path program 1 times [2020-07-21 21:08:12,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:12,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266919042] [2020-07-21 21:08:12,811 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:13,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:13,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:13,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 1175 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:08:13,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:13,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:08:13,645 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:13,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266919042] [2020-07-21 21:08:13,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:13,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:13,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142922883] [2020-07-21 21:08:13,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:13,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:13,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:13,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:13,647 INFO L87 Difference]: Start difference. First operand 186538 states and 293311 transitions. Second operand 4 states. [2020-07-21 21:08:40,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:40,188 INFO L93 Difference]: Finished difference Result 536023 states and 841462 transitions. [2020-07-21 21:08:40,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:40,189 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 337 [2020-07-21 21:08:40,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:40,698 INFO L225 Difference]: With dead ends: 536023 [2020-07-21 21:08:40,698 INFO L226 Difference]: Without dead ends: 349779 [2020-07-21 21:08:40,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:08:41,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349779 states. [2020-07-21 21:09:12,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349779 to 349777. [2020-07-21 21:09:12,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349777 states. [2020-07-21 21:09:13,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349777 states to 349777 states and 545332 transitions. [2020-07-21 21:09:13,019 INFO L78 Accepts]: Start accepts. Automaton has 349777 states and 545332 transitions. Word has length 337 [2020-07-21 21:09:13,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:13,019 INFO L479 AbstractCegarLoop]: Abstraction has 349777 states and 545332 transitions. [2020-07-21 21:09:13,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:09:13,019 INFO L276 IsEmpty]: Start isEmpty. Operand 349777 states and 545332 transitions. [2020-07-21 21:09:13,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-21 21:09:13,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:13,123 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] [2020-07-21 21:09:13,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:13,324 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:13,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:13,324 INFO L82 PathProgramCache]: Analyzing trace with hash 75608660, now seen corresponding path program 1 times [2020-07-21 21:09:13,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:13,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374257517] [2020-07-21 21:09:13,325 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:13,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:09:13,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:13,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 1177 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:09:13,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:14,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:09:14,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:14,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374257517] [2020-07-21 21:09:14,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:14,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:09:14,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669315262] [2020-07-21 21:09:14,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:09:14,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:14,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:09:14,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:09:14,417 INFO L87 Difference]: Start difference. First operand 349777 states and 545332 transitions. Second operand 4 states. [2020-07-21 21:10:13,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:10:13,586 INFO L93 Difference]: Finished difference Result 1037724 states and 1617386 transitions. [2020-07-21 21:10:13,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:10:13,586 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 339 [2020-07-21 21:10:13,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:10:14,981 INFO L225 Difference]: With dead ends: 1037724 [2020-07-21 21:10:14,981 INFO L226 Difference]: Without dead ends: 688309 [2020-07-21 21:10:15,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:10:15,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688309 states. [2020-07-21 21:11:26,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688309 to 688307. [2020-07-21 21:11:26,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 688307 states. [2020-07-21 21:11:27,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 688307 states to 688307 states and 1068223 transitions. [2020-07-21 21:11:27,957 INFO L78 Accepts]: Start accepts. Automaton has 688307 states and 1068223 transitions. Word has length 339 [2020-07-21 21:11:27,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:11:27,957 INFO L479 AbstractCegarLoop]: Abstraction has 688307 states and 1068223 transitions. [2020-07-21 21:11:27,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:11:27,958 INFO L276 IsEmpty]: Start isEmpty. Operand 688307 states and 1068223 transitions. [2020-07-21 21:11:28,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-21 21:11:28,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:11:28,157 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] [2020-07-21 21:11:28,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:11:28,358 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:11:28,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:11:28,359 INFO L82 PathProgramCache]: Analyzing trace with hash 851061898, now seen corresponding path program 1 times [2020-07-21 21:11:28,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:11:28,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590706958] [2020-07-21 21:11:28,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:11:28,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:11:28,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:11:28,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:11:28,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:11:28,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:11:28,767 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:11:28,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590706958] [2020-07-21 21:11:28,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:11:28,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:11:28,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997932244] [2020-07-21 21:11:28,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:11:28,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:11:28,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:11:28,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:11:28,769 INFO L87 Difference]: Start difference. First operand 688307 states and 1068223 transitions. Second operand 3 states. [2020-07-21 21:13:31,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:13:31,382 INFO L93 Difference]: Finished difference Result 2025089 states and 3138959 transitions. [2020-07-21 21:13:31,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:13:31,383 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 341 [2020-07-21 21:13:31,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:13:33,318 INFO L225 Difference]: With dead ends: 2025089 [2020-07-21 21:13:33,319 INFO L226 Difference]: Without dead ends: 1340562 [2020-07-21 21:13:33,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:13:35,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1340562 states.