/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 18:35:42,934 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 18:35:42,936 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 18:35:42,955 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 18:35:42,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 18:35:42,957 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 18:35:42,959 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 18:35:42,969 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 18:35:42,973 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 18:35:42,976 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 18:35:42,977 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 18:35:42,979 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 18:35:42,979 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 18:35:42,980 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 18:35:42,982 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 18:35:42,983 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 18:35:42,985 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 18:35:42,985 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 18:35:42,987 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 18:35:42,992 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 18:35:42,996 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 18:35:43,000 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 18:35:43,001 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 18:35:43,001 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 18:35:43,004 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 18:35:43,004 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 18:35:43,004 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 18:35:43,006 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 18:35:43,007 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 18:35:43,009 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 18:35:43,009 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 18:35:43,010 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 18:35:43,010 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 18:35:43,011 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 18:35:43,012 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 18:35:43,012 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 18:35:43,013 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 18:35:43,013 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 18:35:43,013 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 18:35:43,014 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 18:35:43,015 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 18:35:43,016 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 18:35:43,050 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 18:35:43,050 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 18:35:43,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 18:35:43,053 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 18:35:43,054 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 18:35:43,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 18:35:43,054 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 18:35:43,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 18:35:43,054 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 18:35:43,055 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 18:35:43,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 18:35:43,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 18:35:43,057 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 18:35:43,057 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 18:35:43,057 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 18:35:43,058 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 18:35:43,058 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 18:35:43,058 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 18:35:43,058 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 18:35:43,059 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 18:35:43,059 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 18:35:43,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:35:43,059 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 18:35:43,059 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 18:35:43,060 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 18:35:43,332 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 18:35:43,344 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 18:35:43,347 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 18:35:43,349 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 18:35:43,349 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 18:35:43,350 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:35:43,420 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a63711f59/e9254d4e85fb49498f16ca49d5cb1fd4/FLAG4932240fc [2020-07-20 18:35:44,010 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 18:35:44,011 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:35:44,038 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a63711f59/e9254d4e85fb49498f16ca49d5cb1fd4/FLAG4932240fc [2020-07-20 18:35:44,222 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a63711f59/e9254d4e85fb49498f16ca49d5cb1fd4 [2020-07-20 18:35:44,233 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 18:35:44,236 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 18:35:44,240 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 18:35:44,241 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 18:35:44,244 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 18:35:44,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:35:44" (1/1) ... [2020-07-20 18:35:44,247 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3af93978 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:44, skipping insertion in model container [2020-07-20 18:35:44,248 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:35:44" (1/1) ... [2020-07-20 18:35:44,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 18:35:44,430 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 18:35:46,014 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:35:46,038 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 18:35:46,933 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:35:46,964 INFO L208 MainTranslator]: Completed translation [2020-07-20 18:35:46,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46 WrapperNode [2020-07-20 18:35:46,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 18:35:46,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 18:35:46,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 18:35:46,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 18:35:46,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:46,981 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,018 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,019 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,146 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,169 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... [2020-07-20 18:35:47,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 18:35:47,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 18:35:47,196 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 18:35:47,196 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 18:35:47,197 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:35:47,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 18:35:47,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 18:35:47,286 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 18:35:47,286 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 18:35:47,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 18:35:47,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 18:35:47,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 18:35:47,288 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 18:35:47,288 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 18:35:47,288 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 18:35:47,289 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 18:35:47,289 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 18:35:47,290 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 18:35:47,290 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 18:35:47,290 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 18:35:47,291 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 18:35:47,291 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 18:35:47,291 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 18:35:47,291 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 18:35:47,292 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 18:35:47,292 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 18:35:47,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 18:35:47,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 18:35:51,070 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 18:35:51,070 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 18:35:51,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:35:51 BoogieIcfgContainer [2020-07-20 18:35:51,083 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 18:35:51,084 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 18:35:51,084 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 18:35:51,087 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 18:35:51,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:35:44" (1/3) ... [2020-07-20 18:35:51,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e6b61c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:35:51, skipping insertion in model container [2020-07-20 18:35:51,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:35:46" (2/3) ... [2020-07-20 18:35:51,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e6b61c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:35:51, skipping insertion in model container [2020-07-20 18:35:51,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:35:51" (3/3) ... [2020-07-20 18:35:51,090 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 18:35:51,100 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 18:35:51,110 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 18:35:51,124 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 18:35:51,157 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 18:35:51,157 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 18:35:51,157 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 18:35:51,157 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 18:35:51,157 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 18:35:51,158 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 18:35:51,158 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 18:35:51,158 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 18:35:51,197 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-07-20 18:35:51,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 18:35:51,240 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:35:51,241 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:35:51,242 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:35:51,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:35:51,248 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-07-20 18:35:51,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:35:51,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209497390] [2020-07-20 18:35:51,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:51,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:35:51,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:35:51,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 1408 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 18:35:51,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:35:52,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:35:52,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:35:52,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209497390] [2020-07-20 18:35:52,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:35:52,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:35:52,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659517376] [2020-07-20 18:35:52,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:35:52,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:35:52,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:35:52,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:52,207 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 3 states. [2020-07-20 18:35:52,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:35:52,582 INFO L93 Difference]: Finished difference Result 1974 states and 3501 transitions. [2020-07-20 18:35:52,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:35:52,584 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-20 18:35:52,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:35:52,614 INFO L225 Difference]: With dead ends: 1974 [2020-07-20 18:35:52,614 INFO L226 Difference]: Without dead ends: 1732 [2020-07-20 18:35:52,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:52,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1732 states. [2020-07-20 18:35:52,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1732 to 1730. [2020-07-20 18:35:52,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1730 states. [2020-07-20 18:35:52,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1730 states to 1730 states and 2860 transitions. [2020-07-20 18:35:52,751 INFO L78 Accepts]: Start accepts. Automaton has 1730 states and 2860 transitions. Word has length 496 [2020-07-20 18:35:52,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:35:52,752 INFO L479 AbstractCegarLoop]: Abstraction has 1730 states and 2860 transitions. [2020-07-20 18:35:52,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:35:52,753 INFO L276 IsEmpty]: Start isEmpty. Operand 1730 states and 2860 transitions. [2020-07-20 18:35:52,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 18:35:52,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:35:52,767 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:35:52,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:52,981 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:35:52,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:35:52,982 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-07-20 18:35:52,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:35:52,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419470762] [2020-07-20 18:35:52,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:53,567 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:35:53,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:35:53,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 2840 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:35:53,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:35:53,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:35:53,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:35:53,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419470762] [2020-07-20 18:35:53,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:35:53,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:35:53,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475798380] [2020-07-20 18:35:53,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:35:53,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:35:53,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:35:53,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:35:53,926 INFO L87 Difference]: Start difference. First operand 1730 states and 2860 transitions. Second operand 4 states. [2020-07-20 18:35:54,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:35:54,268 INFO L93 Difference]: Finished difference Result 5126 states and 8475 transitions. [2020-07-20 18:35:54,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:35:54,269 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-20 18:35:54,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:35:54,290 INFO L225 Difference]: With dead ends: 5126 [2020-07-20 18:35:54,290 INFO L226 Difference]: Without dead ends: 3413 [2020-07-20 18:35:54,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:35:54,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3413 states. [2020-07-20 18:35:54,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3413 to 3411. [2020-07-20 18:35:54,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3411 states. [2020-07-20 18:35:54,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 5618 transitions. [2020-07-20 18:35:54,488 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 5618 transitions. Word has length 496 [2020-07-20 18:35:54,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:35:54,493 INFO L479 AbstractCegarLoop]: Abstraction has 3411 states and 5618 transitions. [2020-07-20 18:35:54,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:35:54,493 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 5618 transitions. [2020-07-20 18:35:54,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 18:35:54,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:35:54,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:35:54,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:54,723 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:35:54,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:35:54,724 INFO L82 PathProgramCache]: Analyzing trace with hash 589891249, now seen corresponding path program 1 times [2020-07-20 18:35:54,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:35:54,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601775899] [2020-07-20 18:35:54,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:55,241 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:35:55,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:35:55,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 2844 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:35:55,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:35:55,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:35:55,510 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:35:55,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601775899] [2020-07-20 18:35:55,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:35:55,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:35:55,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15935867] [2020-07-20 18:35:55,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:35:55,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:35:55,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:35:55,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:55,513 INFO L87 Difference]: Start difference. First operand 3411 states and 5618 transitions. Second operand 3 states. [2020-07-20 18:35:55,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:35:55,907 INFO L93 Difference]: Finished difference Result 9941 states and 16335 transitions. [2020-07-20 18:35:55,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:35:55,908 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-20 18:35:55,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:35:55,951 INFO L225 Difference]: With dead ends: 9941 [2020-07-20 18:35:55,951 INFO L226 Difference]: Without dead ends: 6744 [2020-07-20 18:35:55,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:55,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6744 states. [2020-07-20 18:35:56,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6744 to 6742. [2020-07-20 18:35:56,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6742 states. [2020-07-20 18:35:56,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6742 states to 6742 states and 11069 transitions. [2020-07-20 18:35:56,283 INFO L78 Accepts]: Start accepts. Automaton has 6742 states and 11069 transitions. Word has length 498 [2020-07-20 18:35:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:35:56,284 INFO L479 AbstractCegarLoop]: Abstraction has 6742 states and 11069 transitions. [2020-07-20 18:35:56,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:35:56,284 INFO L276 IsEmpty]: Start isEmpty. Operand 6742 states and 11069 transitions. [2020-07-20 18:35:56,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 18:35:56,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:35:56,300 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:35:56,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:56,516 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:35:56,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:35:56,517 INFO L82 PathProgramCache]: Analyzing trace with hash -844140139, now seen corresponding path program 1 times [2020-07-20 18:35:56,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:35:56,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489493023] [2020-07-20 18:35:56,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:57,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:35:57,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:35:57,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 2845 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:35:57,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:35:57,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:35:57,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:35:57,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489493023] [2020-07-20 18:35:57,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:35:57,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:35:57,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868484396] [2020-07-20 18:35:57,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:35:57,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:35:57,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:35:57,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:57,327 INFO L87 Difference]: Start difference. First operand 6742 states and 11069 transitions. Second operand 3 states. [2020-07-20 18:35:57,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:35:57,897 INFO L93 Difference]: Finished difference Result 20129 states and 33039 transitions. [2020-07-20 18:35:57,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:35:57,898 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-20 18:35:57,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:35:57,977 INFO L225 Difference]: With dead ends: 20129 [2020-07-20 18:35:57,977 INFO L226 Difference]: Without dead ends: 13439 [2020-07-20 18:35:57,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:58,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13439 states. [2020-07-20 18:35:58,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13439 to 6789. [2020-07-20 18:35:58,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6789 states. [2020-07-20 18:35:58,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6789 states to 6789 states and 11143 transitions. [2020-07-20 18:35:58,384 INFO L78 Accepts]: Start accepts. Automaton has 6789 states and 11143 transitions. Word has length 499 [2020-07-20 18:35:58,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:35:58,384 INFO L479 AbstractCegarLoop]: Abstraction has 6789 states and 11143 transitions. [2020-07-20 18:35:58,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:35:58,385 INFO L276 IsEmpty]: Start isEmpty. Operand 6789 states and 11143 transitions. [2020-07-20 18:35:58,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 18:35:58,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:35:58,403 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:35:58,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:58,617 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:35:58,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:35:58,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1609256108, now seen corresponding path program 1 times [2020-07-20 18:35:58,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:35:58,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242900322] [2020-07-20 18:35:58,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:35:59,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:35:59,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:35:59,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 2845 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:35:59,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:35:59,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:35:59,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:35:59,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242900322] [2020-07-20 18:35:59,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:35:59,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:35:59,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297301789] [2020-07-20 18:35:59,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:35:59,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:35:59,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:35:59,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:35:59,500 INFO L87 Difference]: Start difference. First operand 6789 states and 11143 transitions. Second operand 3 states. [2020-07-20 18:35:59,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:35:59,935 INFO L93 Difference]: Finished difference Result 19664 states and 32180 transitions. [2020-07-20 18:35:59,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:35:59,936 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 18:35:59,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:35:59,970 INFO L225 Difference]: With dead ends: 19664 [2020-07-20 18:35:59,970 INFO L226 Difference]: Without dead ends: 13274 [2020-07-20 18:35:59,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:00,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13274 states. [2020-07-20 18:36:00,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13274 to 13272. [2020-07-20 18:36:00,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13272 states. [2020-07-20 18:36:01,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13272 states to 13272 states and 21681 transitions. [2020-07-20 18:36:01,008 INFO L78 Accepts]: Start accepts. Automaton has 13272 states and 21681 transitions. Word has length 500 [2020-07-20 18:36:01,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:01,009 INFO L479 AbstractCegarLoop]: Abstraction has 13272 states and 21681 transitions. [2020-07-20 18:36:01,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:01,009 INFO L276 IsEmpty]: Start isEmpty. Operand 13272 states and 21681 transitions. [2020-07-20 18:36:01,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 18:36:01,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:01,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:01,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:01,252 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:01,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:01,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1212361551, now seen corresponding path program 1 times [2020-07-20 18:36:01,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:01,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901767126] [2020-07-20 18:36:01,253 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:01,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:36:01,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:01,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 1413 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:36:01,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:01,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:01,678 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:01,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901767126] [2020-07-20 18:36:01,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:01,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:36:01,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483597382] [2020-07-20 18:36:01,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:36:01,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:01,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:36:01,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:01,681 INFO L87 Difference]: Start difference. First operand 13272 states and 21681 transitions. Second operand 3 states. [2020-07-20 18:36:02,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:02,394 INFO L93 Difference]: Finished difference Result 39546 states and 64567 transitions. [2020-07-20 18:36:02,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:36:02,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 18:36:02,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:02,460 INFO L225 Difference]: With dead ends: 39546 [2020-07-20 18:36:02,460 INFO L226 Difference]: Without dead ends: 26413 [2020-07-20 18:36:02,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:02,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26413 states. [2020-07-20 18:36:03,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26413 to 13351. [2020-07-20 18:36:03,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13351 states. [2020-07-20 18:36:03,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13351 states to 13351 states and 21786 transitions. [2020-07-20 18:36:03,082 INFO L78 Accepts]: Start accepts. Automaton has 13351 states and 21786 transitions. Word has length 500 [2020-07-20 18:36:03,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:03,082 INFO L479 AbstractCegarLoop]: Abstraction has 13351 states and 21786 transitions. [2020-07-20 18:36:03,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:03,083 INFO L276 IsEmpty]: Start isEmpty. Operand 13351 states and 21786 transitions. [2020-07-20 18:36:03,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 18:36:03,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:03,107 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:03,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:03,323 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:03,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:03,323 INFO L82 PathProgramCache]: Analyzing trace with hash 319607292, now seen corresponding path program 1 times [2020-07-20 18:36:03,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:03,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78299405] [2020-07-20 18:36:03,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:03,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:36:03,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:03,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 2849 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:36:03,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:04,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:04,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:04,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78299405] [2020-07-20 18:36:04,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:04,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:36:04,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155094740] [2020-07-20 18:36:04,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:36:04,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:04,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:36:04,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:04,037 INFO L87 Difference]: Start difference. First operand 13351 states and 21786 transitions. Second operand 3 states. [2020-07-20 18:36:04,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:04,546 INFO L93 Difference]: Finished difference Result 39706 states and 64788 transitions. [2020-07-20 18:36:04,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:36:04,547 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-20 18:36:04,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:04,587 INFO L225 Difference]: With dead ends: 39706 [2020-07-20 18:36:04,587 INFO L226 Difference]: Without dead ends: 26549 [2020-07-20 18:36:04,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:04,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26549 states. [2020-07-20 18:36:05,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26549 to 13487. [2020-07-20 18:36:05,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13487 states. [2020-07-20 18:36:05,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13487 states to 13487 states and 21978 transitions. [2020-07-20 18:36:05,376 INFO L78 Accepts]: Start accepts. Automaton has 13487 states and 21978 transitions. Word has length 501 [2020-07-20 18:36:05,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:05,377 INFO L479 AbstractCegarLoop]: Abstraction has 13487 states and 21978 transitions. [2020-07-20 18:36:05,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:05,377 INFO L276 IsEmpty]: Start isEmpty. Operand 13487 states and 21978 transitions. [2020-07-20 18:36:05,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 18:36:05,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:05,392 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:05,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:05,594 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:05,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:05,595 INFO L82 PathProgramCache]: Analyzing trace with hash 353604489, now seen corresponding path program 1 times [2020-07-20 18:36:05,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:05,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643812068] [2020-07-20 18:36:05,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:05,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:36:05,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:05,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1703 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:36:05,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:06,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:06,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:06,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643812068] [2020-07-20 18:36:06,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:06,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:36:06,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089489519] [2020-07-20 18:36:06,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:36:06,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:06,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:36:06,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:36:06,167 INFO L87 Difference]: Start difference. First operand 13487 states and 21978 transitions. Second operand 9 states. [2020-07-20 18:36:16,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:16,573 INFO L93 Difference]: Finished difference Result 104850 states and 170318 transitions. [2020-07-20 18:36:16,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 18:36:16,574 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 502 [2020-07-20 18:36:16,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:16,728 INFO L225 Difference]: With dead ends: 104850 [2020-07-20 18:36:16,728 INFO L226 Difference]: Without dead ends: 101764 [2020-07-20 18:36:16,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 18:36:16,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101764 states. [2020-07-20 18:36:18,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101764 to 31579. [2020-07-20 18:36:18,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31579 states. [2020-07-20 18:36:18,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31579 states to 31579 states and 50966 transitions. [2020-07-20 18:36:18,411 INFO L78 Accepts]: Start accepts. Automaton has 31579 states and 50966 transitions. Word has length 502 [2020-07-20 18:36:18,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:18,412 INFO L479 AbstractCegarLoop]: Abstraction has 31579 states and 50966 transitions. [2020-07-20 18:36:18,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:36:18,412 INFO L276 IsEmpty]: Start isEmpty. Operand 31579 states and 50966 transitions. [2020-07-20 18:36:18,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 18:36:18,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:18,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:18,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:18,647 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:18,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:18,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2027344098, now seen corresponding path program 1 times [2020-07-20 18:36:18,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:18,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199368932] [2020-07-20 18:36:18,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:19,124 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:36:19,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:19,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 2857 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:36:19,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:19,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:19,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:19,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199368932] [2020-07-20 18:36:19,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:19,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:36:19,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494413056] [2020-07-20 18:36:19,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:36:19,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:19,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:36:19,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:19,542 INFO L87 Difference]: Start difference. First operand 31579 states and 50966 transitions. Second operand 3 states. [2020-07-20 18:36:21,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:21,651 INFO L93 Difference]: Finished difference Result 73555 states and 118596 transitions. [2020-07-20 18:36:21,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:36:21,651 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 18:36:21,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:21,723 INFO L225 Difference]: With dead ends: 73555 [2020-07-20 18:36:21,723 INFO L226 Difference]: Without dead ends: 46517 [2020-07-20 18:36:21,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:21,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46517 states. [2020-07-20 18:36:24,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46517 to 40439. [2020-07-20 18:36:24,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40439 states. [2020-07-20 18:36:24,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40439 states to 40439 states and 65574 transitions. [2020-07-20 18:36:24,439 INFO L78 Accepts]: Start accepts. Automaton has 40439 states and 65574 transitions. Word has length 502 [2020-07-20 18:36:24,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:24,439 INFO L479 AbstractCegarLoop]: Abstraction has 40439 states and 65574 transitions. [2020-07-20 18:36:24,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:24,439 INFO L276 IsEmpty]: Start isEmpty. Operand 40439 states and 65574 transitions. [2020-07-20 18:36:24,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 18:36:24,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:24,458 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:24,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:24,671 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:24,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:24,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1516159687, now seen corresponding path program 1 times [2020-07-20 18:36:24,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:24,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754463311] [2020-07-20 18:36:24,674 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:25,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:36:25,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:25,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 2849 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:36:25,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:25,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:25,558 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:25,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754463311] [2020-07-20 18:36:25,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:25,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:36:25,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808023955] [2020-07-20 18:36:25,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:36:25,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:25,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:36:25,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:25,560 INFO L87 Difference]: Start difference. First operand 40439 states and 65574 transitions. Second operand 3 states. [2020-07-20 18:36:28,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:28,479 INFO L93 Difference]: Finished difference Result 118774 states and 192429 transitions. [2020-07-20 18:36:28,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:36:28,480 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 18:36:28,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:28,590 INFO L225 Difference]: With dead ends: 118774 [2020-07-20 18:36:28,590 INFO L226 Difference]: Without dead ends: 79304 [2020-07-20 18:36:28,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:36:28,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79304 states. [2020-07-20 18:36:33,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79304 to 79302. [2020-07-20 18:36:33,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79302 states. [2020-07-20 18:36:33,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79302 states to 79302 states and 128127 transitions. [2020-07-20 18:36:33,159 INFO L78 Accepts]: Start accepts. Automaton has 79302 states and 128127 transitions. Word has length 502 [2020-07-20 18:36:33,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:33,159 INFO L479 AbstractCegarLoop]: Abstraction has 79302 states and 128127 transitions. [2020-07-20 18:36:33,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:33,159 INFO L276 IsEmpty]: Start isEmpty. Operand 79302 states and 128127 transitions. [2020-07-20 18:36:33,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 18:36:33,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:33,204 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:33,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:33,419 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:33,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:33,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1083405788, now seen corresponding path program 1 times [2020-07-20 18:36:33,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:33,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514900479] [2020-07-20 18:36:33,422 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:33,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:36:33,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:33,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 1415 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:36:33,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:34,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:34,199 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:34,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514900479] [2020-07-20 18:36:34,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:34,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:36:34,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171965557] [2020-07-20 18:36:34,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:36:34,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:34,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:36:34,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:36:34,201 INFO L87 Difference]: Start difference. First operand 79302 states and 128127 transitions. Second operand 4 states. [2020-07-20 18:36:41,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:36:41,763 INFO L93 Difference]: Finished difference Result 230212 states and 371389 transitions. [2020-07-20 18:36:41,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:36:41,763 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 502 [2020-07-20 18:36:41,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:36:41,914 INFO L225 Difference]: With dead ends: 230212 [2020-07-20 18:36:41,914 INFO L226 Difference]: Without dead ends: 153190 [2020-07-20 18:36:41,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:36:42,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153190 states. [2020-07-20 18:36:45,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153190 to 80595. [2020-07-20 18:36:45,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80595 states. [2020-07-20 18:36:45,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80595 states to 80595 states and 130406 transitions. [2020-07-20 18:36:45,827 INFO L78 Accepts]: Start accepts. Automaton has 80595 states and 130406 transitions. Word has length 502 [2020-07-20 18:36:45,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:45,827 INFO L479 AbstractCegarLoop]: Abstraction has 80595 states and 130406 transitions. [2020-07-20 18:36:45,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:36:45,828 INFO L276 IsEmpty]: Start isEmpty. Operand 80595 states and 130406 transitions. [2020-07-20 18:36:45,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 18:36:45,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:45,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:36:46,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:46,089 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:46,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:46,090 INFO L82 PathProgramCache]: Analyzing trace with hash -405833094, now seen corresponding path program 1 times [2020-07-20 18:36:46,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:46,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335188312] [2020-07-20 18:36:46,092 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:46,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:36:46,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:46,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 1427 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:36:46,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:46,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:46,660 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:46,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335188312] [2020-07-20 18:36:46,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:46,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:36:46,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977855326] [2020-07-20 18:36:46,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:36:46,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:46,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:36:46,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:36:46,662 INFO L87 Difference]: Start difference. First operand 80595 states and 130406 transitions. Second operand 9 states. [2020-07-20 18:37:24,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:37:24,159 INFO L93 Difference]: Finished difference Result 540104 states and 881169 transitions. [2020-07-20 18:37:24,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 18:37:24,160 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 504 [2020-07-20 18:37:24,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:37:24,796 INFO L225 Difference]: With dead ends: 540104 [2020-07-20 18:37:24,796 INFO L226 Difference]: Without dead ends: 510966 [2020-07-20 18:37:24,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=347, Invalid=985, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 18:37:25,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510966 states. [2020-07-20 18:37:38,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510966 to 161875. [2020-07-20 18:37:38,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161875 states. [2020-07-20 18:37:39,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161875 states to 161875 states and 261274 transitions. [2020-07-20 18:37:39,000 INFO L78 Accepts]: Start accepts. Automaton has 161875 states and 261274 transitions. Word has length 504 [2020-07-20 18:37:39,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:37:39,001 INFO L479 AbstractCegarLoop]: Abstraction has 161875 states and 261274 transitions. [2020-07-20 18:37:39,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:37:39,002 INFO L276 IsEmpty]: Start isEmpty. Operand 161875 states and 261274 transitions. [2020-07-20 18:37:39,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 18:37:39,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:37:39,055 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:37:39,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:37:39,257 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:37:39,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:37:39,258 INFO L82 PathProgramCache]: Analyzing trace with hash -526663878, now seen corresponding path program 1 times [2020-07-20 18:37:39,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:37:39,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160105561] [2020-07-20 18:37:39,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:37:39,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:37:39,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:37:39,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 2862 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 18:37:39,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:37:40,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:37:40,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:37:40,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160105561] [2020-07-20 18:37:40,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:37:40,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 18:37:40,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380057558] [2020-07-20 18:37:40,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:37:40,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:37:40,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:37:40,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:37:40,046 INFO L87 Difference]: Start difference. First operand 161875 states and 261274 transitions. Second operand 8 states. [2020-07-20 18:37:56,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:37:56,458 INFO L93 Difference]: Finished difference Result 297563 states and 483010 transitions. [2020-07-20 18:37:56,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 18:37:56,459 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 504 [2020-07-20 18:37:56,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:37:56,716 INFO L225 Difference]: With dead ends: 297563 [2020-07-20 18:37:56,717 INFO L226 Difference]: Without dead ends: 209189 [2020-07-20 18:37:56,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:37:56,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209189 states. [2020-07-20 18:38:02,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209189 to 74991. [2020-07-20 18:38:02,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74991 states. [2020-07-20 18:38:02,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74991 states to 74991 states and 120330 transitions. [2020-07-20 18:38:02,734 INFO L78 Accepts]: Start accepts. Automaton has 74991 states and 120330 transitions. Word has length 504 [2020-07-20 18:38:02,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:38:02,735 INFO L479 AbstractCegarLoop]: Abstraction has 74991 states and 120330 transitions. [2020-07-20 18:38:02,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:38:02,735 INFO L276 IsEmpty]: Start isEmpty. Operand 74991 states and 120330 transitions. [2020-07-20 18:38:02,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 18:38:02,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:38:02,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:38:02,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:02,970 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:38:02,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:38:02,971 INFO L82 PathProgramCache]: Analyzing trace with hash 490614349, now seen corresponding path program 1 times [2020-07-20 18:38:02,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:38:02,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391295552] [2020-07-20 18:38:02,973 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:05,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:38:05,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:38:05,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 2858 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:38:05,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:38:06,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:38:06,011 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:38:06,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391295552] [2020-07-20 18:38:06,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:38:06,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:38:06,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531192048] [2020-07-20 18:38:06,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:38:06,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:38:06,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:38:06,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:38:06,013 INFO L87 Difference]: Start difference. First operand 74991 states and 120330 transitions. Second operand 3 states. [2020-07-20 18:38:13,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:38:13,392 INFO L93 Difference]: Finished difference Result 173983 states and 278784 transitions. [2020-07-20 18:38:13,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:38:13,393 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-20 18:38:13,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:38:13,505 INFO L225 Difference]: With dead ends: 173983 [2020-07-20 18:38:13,505 INFO L226 Difference]: Without dead ends: 109581 [2020-07-20 18:38:13,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:38:13,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109581 states. [2020-07-20 18:38:21,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109581 to 100511. [2020-07-20 18:38:21,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100511 states. [2020-07-20 18:38:21,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100511 states to 100511 states and 161534 transitions. [2020-07-20 18:38:21,336 INFO L78 Accepts]: Start accepts. Automaton has 100511 states and 161534 transitions. Word has length 504 [2020-07-20 18:38:21,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:38:21,336 INFO L479 AbstractCegarLoop]: Abstraction has 100511 states and 161534 transitions. [2020-07-20 18:38:21,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:38:21,336 INFO L276 IsEmpty]: Start isEmpty. Operand 100511 states and 161534 transitions. [2020-07-20 18:38:21,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 18:38:21,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:38:21,378 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:38:21,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:21,592 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:38:21,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:38:21,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1374306117, now seen corresponding path program 1 times [2020-07-20 18:38:21,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:38:21,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479423804] [2020-07-20 18:38:21,594 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:22,073 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:38:22,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:38:22,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 2862 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:38:22,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:38:22,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:38:22,457 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:38:22,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479423804] [2020-07-20 18:38:22,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:38:22,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 18:38:22,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354433934] [2020-07-20 18:38:22,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 18:38:22,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:38:22,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 18:38:22,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:38:22,459 INFO L87 Difference]: Start difference. First operand 100511 states and 161534 transitions. Second operand 5 states. [2020-07-20 18:38:39,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:38:39,496 INFO L93 Difference]: Finished difference Result 258475 states and 416144 transitions. [2020-07-20 18:38:39,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 18:38:39,497 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 505 [2020-07-20 18:38:39,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:38:39,740 INFO L225 Difference]: With dead ends: 258475 [2020-07-20 18:38:39,740 INFO L226 Difference]: Without dead ends: 189313 [2020-07-20 18:38:39,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 18:38:39,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189313 states. [2020-07-20 18:38:57,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189313 to 189311. [2020-07-20 18:38:57,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189311 states. [2020-07-20 18:38:57,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189311 states to 189311 states and 303182 transitions. [2020-07-20 18:38:57,764 INFO L78 Accepts]: Start accepts. Automaton has 189311 states and 303182 transitions. Word has length 505 [2020-07-20 18:38:57,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:38:57,765 INFO L479 AbstractCegarLoop]: Abstraction has 189311 states and 303182 transitions. [2020-07-20 18:38:57,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 18:38:57,765 INFO L276 IsEmpty]: Start isEmpty. Operand 189311 states and 303182 transitions. [2020-07-20 18:38:57,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 18:38:57,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:38:57,812 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:38:58,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:58,013 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:38:58,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:38:58,013 INFO L82 PathProgramCache]: Analyzing trace with hash -16341642, now seen corresponding path program 1 times [2020-07-20 18:38:58,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:38:58,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636411684] [2020-07-20 18:38:58,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:38:58,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:38:58,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:38:58,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 2863 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:38:58,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:38:58,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:38:58,707 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:38:58,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636411684] [2020-07-20 18:38:58,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:38:58,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:38:58,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128240464] [2020-07-20 18:38:58,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:38:58,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:38:58,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:38:58,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:38:58,710 INFO L87 Difference]: Start difference. First operand 189311 states and 303182 transitions. Second operand 4 states. [2020-07-20 18:39:31,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:39:31,265 INFO L93 Difference]: Finished difference Result 561342 states and 899281 transitions. [2020-07-20 18:39:31,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:39:31,266 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-20 18:39:31,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:39:31,775 INFO L225 Difference]: With dead ends: 561342 [2020-07-20 18:39:31,775 INFO L226 Difference]: Without dead ends: 372294 [2020-07-20 18:39:31,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:39:32,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372294 states. [2020-07-20 18:40:08,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372294 to 372292. [2020-07-20 18:40:08,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372292 states. [2020-07-20 18:40:09,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372292 states to 372292 states and 594937 transitions. [2020-07-20 18:40:09,435 INFO L78 Accepts]: Start accepts. Automaton has 372292 states and 594937 transitions. Word has length 505 [2020-07-20 18:40:09,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:40:09,435 INFO L479 AbstractCegarLoop]: Abstraction has 372292 states and 594937 transitions. [2020-07-20 18:40:09,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:40:09,436 INFO L276 IsEmpty]: Start isEmpty. Operand 372292 states and 594937 transitions. [2020-07-20 18:40:09,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 18:40:09,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:40:09,536 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:40:09,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:40:09,738 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:40:09,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:40:09,739 INFO L82 PathProgramCache]: Analyzing trace with hash -943740687, now seen corresponding path program 1 times [2020-07-20 18:40:09,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:40:09,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664273332] [2020-07-20 18:40:09,740 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:40:10,856 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:40:10,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:40:10,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 2864 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:40:10,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:40:11,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:40:11,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:40:11,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664273332] [2020-07-20 18:40:11,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:40:11,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:40:11,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293340473] [2020-07-20 18:40:11,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:40:11,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:40:11,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:40:11,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:40:11,060 INFO L87 Difference]: Start difference. First operand 372292 states and 594937 transitions. Second operand 3 states. [2020-07-20 18:41:23,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:41:23,864 INFO L93 Difference]: Finished difference Result 1103772 states and 1763962 transitions. [2020-07-20 18:41:23,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:41:23,864 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-20 18:41:23,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:41:24,933 INFO L225 Difference]: With dead ends: 1103772 [2020-07-20 18:41:24,933 INFO L226 Difference]: Without dead ends: 735048 [2020-07-20 18:41:25,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:41:25,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735048 states. [2020-07-20 18:42:47,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735048 to 735046. [2020-07-20 18:42:47,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 735046 states. [2020-07-20 18:42:49,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 735046 states to 735046 states and 1172736 transitions. [2020-07-20 18:42:49,113 INFO L78 Accepts]: Start accepts. Automaton has 735046 states and 1172736 transitions. Word has length 507 [2020-07-20 18:42:49,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:42:49,114 INFO L479 AbstractCegarLoop]: Abstraction has 735046 states and 1172736 transitions. [2020-07-20 18:42:49,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:42:49,114 INFO L276 IsEmpty]: Start isEmpty. Operand 735046 states and 1172736 transitions. [2020-07-20 18:42:49,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 18:42:49,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:42:49,321 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:42:49,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:42:49,522 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:42:49,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:42:49,524 INFO L82 PathProgramCache]: Analyzing trace with hash 722155973, now seen corresponding path program 1 times [2020-07-20 18:42:49,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:42:49,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662301728] [2020-07-20 18:42:49,525 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:42:49,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:42:49,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:42:49,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 1419 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:42:49,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:42:49,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:42:49,969 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:42:49,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662301728] [2020-07-20 18:42:49,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:42:49,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:42:49,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150628354] [2020-07-20 18:42:49,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:42:49,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:42:49,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:42:49,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:42:49,971 INFO L87 Difference]: Start difference. First operand 735046 states and 1172736 transitions. Second operand 3 states. [2020-07-20 18:45:28,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:45:28,816 INFO L93 Difference]: Finished difference Result 2184508 states and 3481575 transitions. [2020-07-20 18:45:28,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:45:28,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-20 18:45:28,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:45:31,547 INFO L225 Difference]: With dead ends: 2184508 [2020-07-20 18:45:31,547 INFO L226 Difference]: Without dead ends: 1459832 [2020-07-20 18:45:32,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:45:33,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1459832 states. [2020-07-20 18:47:02,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1459832 to 736870. [2020-07-20 18:47:02,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 736870 states. [2020-07-20 18:47:03,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 736870 states to 736870 states and 1175495 transitions. [2020-07-20 18:47:03,411 INFO L78 Accepts]: Start accepts. Automaton has 736870 states and 1175495 transitions. Word has length 507 [2020-07-20 18:47:03,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:47:03,412 INFO L479 AbstractCegarLoop]: Abstraction has 736870 states and 1175495 transitions. [2020-07-20 18:47:03,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:47:03,412 INFO L276 IsEmpty]: Start isEmpty. Operand 736870 states and 1175495 transitions. [2020-07-20 18:47:03,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-20 18:47:03,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:47:03,643 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:47:03,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:47:03,844 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:47:03,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:47:03,845 INFO L82 PathProgramCache]: Analyzing trace with hash -5625522, now seen corresponding path program 1 times [2020-07-20 18:47:03,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:47:03,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642957129] [2020-07-20 18:47:03,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:47:04,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:47:04,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:47:04,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 1708 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:47:04,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:47:04,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:47:04,450 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:47:04,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642957129] [2020-07-20 18:47:04,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:47:04,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:47:04,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692924918] [2020-07-20 18:47:04,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:47:04,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:47:04,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:47:04,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:47:04,454 INFO L87 Difference]: Start difference. First operand 736870 states and 1175495 transitions. Second operand 9 states.