/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 15:00:59,342 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 15:00:59,344 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 15:00:59,362 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 15:00:59,362 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 15:00:59,365 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 15:00:59,367 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 15:00:59,380 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 15:00:59,381 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 15:00:59,383 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 15:00:59,384 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 15:00:59,386 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 15:00:59,386 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 15:00:59,390 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 15:00:59,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 15:00:59,394 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 15:00:59,396 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 15:00:59,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 15:00:59,399 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 15:00:59,405 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 15:00:59,409 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 15:00:59,410 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 15:00:59,411 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 15:00:59,413 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 15:00:59,415 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 15:00:59,416 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 15:00:59,416 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 15:00:59,418 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 15:00:59,419 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 15:00:59,420 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 15:00:59,420 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 15:00:59,422 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 15:00:59,422 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 15:00:59,423 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 15:00:59,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 15:00:59,428 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 15:00:59,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 15:00:59,428 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 15:00:59,429 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 15:00:59,429 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 15:00:59,431 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 15:00:59,432 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 15:00:59,454 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 15:00:59,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 15:00:59,456 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 15:00:59,456 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 15:00:59,457 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 15:00:59,457 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 15:00:59,457 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 15:00:59,457 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 15:00:59,457 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 15:00:59,458 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 15:00:59,459 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 15:00:59,459 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 15:00:59,459 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 15:00:59,460 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 15:00:59,460 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 15:00:59,460 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 15:00:59,460 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 15:00:59,461 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 15:00:59,461 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 15:00:59,461 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 15:00:59,461 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 15:00:59,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:00:59,462 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 15:00:59,462 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 15:00:59,462 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 15:00:59,462 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 15:00:59,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:00:59,463 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 15:00:59,463 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 15:00:59,463 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 15:00:59,766 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 15:00:59,779 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 15:00:59,783 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 15:00:59,784 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 15:00:59,785 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 15:00:59,786 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 15:00:59,848 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6927c88a8/3956033463f24a1cbff32a7974627fb6/FLAG63cf3f8dd [2020-07-20 15:01:00,574 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 15:01:00,575 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 15:01:00,607 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6927c88a8/3956033463f24a1cbff32a7974627fb6/FLAG63cf3f8dd [2020-07-20 15:01:00,688 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6927c88a8/3956033463f24a1cbff32a7974627fb6 [2020-07-20 15:01:00,697 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 15:01:00,699 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 15:01:00,700 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 15:01:00,700 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 15:01:00,704 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 15:01:00,705 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:01:00" (1/1) ... [2020-07-20 15:01:00,708 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5da7f1fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:00, skipping insertion in model container [2020-07-20 15:01:00,708 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:01:00" (1/1) ... [2020-07-20 15:01:00,715 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 15:01:00,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 15:01:02,391 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:01:02,415 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 15:01:04,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:01:04,064 INFO L208 MainTranslator]: Completed translation [2020-07-20 15:01:04,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04 WrapperNode [2020-07-20 15:01:04,066 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 15:01:04,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 15:01:04,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 15:01:04,067 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 15:01:04,082 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,084 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,140 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,142 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,209 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,264 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,287 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... [2020-07-20 15:01:04,312 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 15:01:04,314 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 15:01:04,314 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 15:01:04,314 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 15:01:04,316 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:01:04,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 15:01:04,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 15:01:04,411 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 15:01:04,411 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 15:01:04,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 15:01:04,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 15:01:04,413 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 15:01:04,413 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 15:01:04,413 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 15:01:04,413 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 15:01:04,414 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 15:01:04,415 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 15:01:04,415 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 15:01:04,415 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 15:01:04,415 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 15:01:04,416 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 15:01:04,417 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 15:01:04,417 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 15:01:04,417 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 15:01:04,418 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 15:01:04,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 15:01:04,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 15:01:08,967 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 15:01:08,967 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 15:01:08,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:01:08 BoogieIcfgContainer [2020-07-20 15:01:08,982 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 15:01:08,983 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 15:01:08,983 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 15:01:08,987 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 15:01:08,987 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:01:00" (1/3) ... [2020-07-20 15:01:08,988 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@281bf312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:01:08, skipping insertion in model container [2020-07-20 15:01:08,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:01:04" (2/3) ... [2020-07-20 15:01:08,988 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@281bf312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:01:08, skipping insertion in model container [2020-07-20 15:01:08,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:01:08" (3/3) ... [2020-07-20 15:01:08,991 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-07-20 15:01:09,005 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 15:01:09,018 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 15:01:09,033 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 15:01:09,068 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 15:01:09,068 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 15:01:09,068 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 15:01:09,069 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 15:01:09,069 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 15:01:09,069 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 15:01:09,069 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 15:01:09,069 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 15:01:09,117 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states. [2020-07-20 15:01:09,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-20 15:01:09,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:09,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:09,158 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:09,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:09,165 INFO L82 PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times [2020-07-20 15:01:09,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:09,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438980557] [2020-07-20 15:01:09,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:09,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:09,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:09,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 1626 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:01:09,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:10,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:10,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:10,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438980557] [2020-07-20 15:01:10,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:10,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:01:10,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996436876] [2020-07-20 15:01:10,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:01:10,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:10,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:01:10,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:01:10,335 INFO L87 Difference]: Start difference. First operand 1371 states. Second operand 4 states. [2020-07-20 15:01:10,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:10,809 INFO L93 Difference]: Finished difference Result 4059 states and 7350 transitions. [2020-07-20 15:01:10,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 15:01:10,811 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 464 [2020-07-20 15:01:10,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:10,848 INFO L225 Difference]: With dead ends: 4059 [2020-07-20 15:01:10,848 INFO L226 Difference]: Without dead ends: 2697 [2020-07-20 15:01:10,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:01:10,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2020-07-20 15:01:11,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647. [2020-07-20 15:01:11,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-07-20 15:01:11,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions. [2020-07-20 15:01:11,050 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464 [2020-07-20 15:01:11,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:11,051 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions. [2020-07-20 15:01:11,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:01:11,052 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions. [2020-07-20 15:01:11,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-07-20 15:01:11,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:11,067 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] [2020-07-20 15:01:11,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:11,282 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:11,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:11,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times [2020-07-20 15:01:11,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:11,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91495102] [2020-07-20 15:01:11,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:11,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:11,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:11,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 1629 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:11,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:12,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:12,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:12,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91495102] [2020-07-20 15:01:12,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:12,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:12,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478266781] [2020-07-20 15:01:12,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:12,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:12,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:12,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:12,115 INFO L87 Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 3 states. [2020-07-20 15:01:12,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:12,480 INFO L93 Difference]: Finished difference Result 7670 states and 12560 transitions. [2020-07-20 15:01:12,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:12,481 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 466 [2020-07-20 15:01:12,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:12,518 INFO L225 Difference]: With dead ends: 7670 [2020-07-20 15:01:12,519 INFO L226 Difference]: Without dead ends: 5237 [2020-07-20 15:01:12,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:12,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5237 states. [2020-07-20 15:01:12,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189. [2020-07-20 15:01:12,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5189 states. [2020-07-20 15:01:12,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions. [2020-07-20 15:01:12,843 INFO L78 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466 [2020-07-20 15:01:12,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:12,848 INFO L479 AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions. [2020-07-20 15:01:12,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:12,849 INFO L276 IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions. [2020-07-20 15:01:12,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 15:01:12,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:12,864 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] [2020-07-20 15:01:13,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:13,078 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:13,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:13,079 INFO L82 PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times [2020-07-20 15:01:13,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:13,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583887566] [2020-07-20 15:01:13,080 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:13,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:13,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:13,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:13,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:14,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:14,316 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:14,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583887566] [2020-07-20 15:01:14,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:14,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:14,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060907122] [2020-07-20 15:01:14,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:14,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:14,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:14,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:14,322 INFO L87 Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 3 states. [2020-07-20 15:01:14,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:14,721 INFO L93 Difference]: Finished difference Result 15470 states and 25323 transitions. [2020-07-20 15:01:14,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:14,721 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 467 [2020-07-20 15:01:14,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:14,774 INFO L225 Difference]: With dead ends: 15470 [2020-07-20 15:01:14,774 INFO L226 Difference]: Without dead ends: 10333 [2020-07-20 15:01:14,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 465 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:14,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10333 states. [2020-07-20 15:01:15,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10333 to 5236. [2020-07-20 15:01:15,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5236 states. [2020-07-20 15:01:15,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5236 states to 5236 states and 8571 transitions. [2020-07-20 15:01:15,088 INFO L78 Accepts]: Start accepts. Automaton has 5236 states and 8571 transitions. Word has length 467 [2020-07-20 15:01:15,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:15,088 INFO L479 AbstractCegarLoop]: Abstraction has 5236 states and 8571 transitions. [2020-07-20 15:01:15,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:15,088 INFO L276 IsEmpty]: Start isEmpty. Operand 5236 states and 8571 transitions. [2020-07-20 15:01:15,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 15:01:15,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:15,103 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] [2020-07-20 15:01:15,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:15,318 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:15,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:15,318 INFO L82 PathProgramCache]: Analyzing trace with hash 536524677, now seen corresponding path program 1 times [2020-07-20 15:01:15,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:15,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518582192] [2020-07-20 15:01:15,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:15,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:15,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:15,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:15,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:16,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:16,127 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:16,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518582192] [2020-07-20 15:01:16,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:16,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:16,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347495978] [2020-07-20 15:01:16,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:16,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:16,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:16,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:16,130 INFO L87 Difference]: Start difference. First operand 5236 states and 8571 transitions. Second operand 3 states. [2020-07-20 15:01:16,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:16,671 INFO L93 Difference]: Finished difference Result 15048 states and 24542 transitions. [2020-07-20 15:01:16,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:16,671 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 468 [2020-07-20 15:01:16,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:16,715 INFO L225 Difference]: With dead ends: 15048 [2020-07-20 15:01:16,716 INFO L226 Difference]: Without dead ends: 10211 [2020-07-20 15:01:16,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:16,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10211 states. [2020-07-20 15:01:17,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10211 to 10165. [2020-07-20 15:01:17,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10165 states. [2020-07-20 15:01:17,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10165 states to 10165 states and 16557 transitions. [2020-07-20 15:01:17,115 INFO L78 Accepts]: Start accepts. Automaton has 10165 states and 16557 transitions. Word has length 468 [2020-07-20 15:01:17,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:17,116 INFO L479 AbstractCegarLoop]: Abstraction has 10165 states and 16557 transitions. [2020-07-20 15:01:17,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:17,116 INFO L276 IsEmpty]: Start isEmpty. Operand 10165 states and 16557 transitions. [2020-07-20 15:01:17,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 15:01:17,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:17,141 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] [2020-07-20 15:01:17,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:17,354 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:17,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:17,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1157993354, now seen corresponding path program 1 times [2020-07-20 15:01:17,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:17,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698293432] [2020-07-20 15:01:17,356 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:17,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:01:17,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:17,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1431 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:17,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:18,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:18,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:18,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698293432] [2020-07-20 15:01:18,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:18,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:18,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510304109] [2020-07-20 15:01:18,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:18,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:18,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:18,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:18,184 INFO L87 Difference]: Start difference. First operand 10165 states and 16557 transitions. Second operand 3 states. [2020-07-20 15:01:18,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:18,662 INFO L93 Difference]: Finished difference Result 30225 states and 49195 transitions. [2020-07-20 15:01:18,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:18,663 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 468 [2020-07-20 15:01:18,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:18,715 INFO L225 Difference]: With dead ends: 30225 [2020-07-20 15:01:18,719 INFO L226 Difference]: Without dead ends: 20199 [2020-07-20 15:01:18,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:18,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20199 states. [2020-07-20 15:01:19,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20199 to 10244. [2020-07-20 15:01:19,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10244 states. [2020-07-20 15:01:19,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10244 states to 10244 states and 16662 transitions. [2020-07-20 15:01:19,171 INFO L78 Accepts]: Start accepts. Automaton has 10244 states and 16662 transitions. Word has length 468 [2020-07-20 15:01:19,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:19,172 INFO L479 AbstractCegarLoop]: Abstraction has 10244 states and 16662 transitions. [2020-07-20 15:01:19,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:19,172 INFO L276 IsEmpty]: Start isEmpty. Operand 10244 states and 16662 transitions. [2020-07-20 15:01:19,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 15:01:19,197 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:19,198 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] [2020-07-20 15:01:19,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:19,411 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:19,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:19,411 INFO L82 PathProgramCache]: Analyzing trace with hash -903588472, now seen corresponding path program 1 times [2020-07-20 15:01:19,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:19,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705721661] [2020-07-20 15:01:19,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:20,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:20,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:20,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 1633 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:20,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:20,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:20,573 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:20,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705721661] [2020-07-20 15:01:20,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:20,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:20,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865896915] [2020-07-20 15:01:20,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:20,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:20,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:20,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:20,575 INFO L87 Difference]: Start difference. First operand 10244 states and 16662 transitions. Second operand 3 states. [2020-07-20 15:01:21,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:21,037 INFO L93 Difference]: Finished difference Result 30385 states and 49416 transitions. [2020-07-20 15:01:21,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:21,037 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 469 [2020-07-20 15:01:21,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:21,092 INFO L225 Difference]: With dead ends: 30385 [2020-07-20 15:01:21,093 INFO L226 Difference]: Without dead ends: 20335 [2020-07-20 15:01:21,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:21,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20335 states. [2020-07-20 15:01:21,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20335 to 10380. [2020-07-20 15:01:21,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10380 states. [2020-07-20 15:01:21,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10380 states to 10380 states and 16854 transitions. [2020-07-20 15:01:21,603 INFO L78 Accepts]: Start accepts. Automaton has 10380 states and 16854 transitions. Word has length 469 [2020-07-20 15:01:21,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:21,603 INFO L479 AbstractCegarLoop]: Abstraction has 10380 states and 16854 transitions. [2020-07-20 15:01:21,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:21,604 INFO L276 IsEmpty]: Start isEmpty. Operand 10380 states and 16854 transitions. [2020-07-20 15:01:21,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 15:01:21,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:21,623 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] [2020-07-20 15:01:21,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:21,838 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:21,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:21,839 INFO L82 PathProgramCache]: Analyzing trace with hash 2073063424, now seen corresponding path program 1 times [2020-07-20 15:01:21,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:21,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458464344] [2020-07-20 15:01:21,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:22,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:22,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:22,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 1633 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:22,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:22,531 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 15:01:22,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:22,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458464344] [2020-07-20 15:01:22,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:22,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:22,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986716608] [2020-07-20 15:01:22,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:22,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:22,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:22,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:22,533 INFO L87 Difference]: Start difference. First operand 10380 states and 16854 transitions. Second operand 3 states. [2020-07-20 15:01:23,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:23,145 INFO L93 Difference]: Finished difference Result 29456 states and 47707 transitions. [2020-07-20 15:01:23,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:23,146 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 470 [2020-07-20 15:01:23,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:23,208 INFO L225 Difference]: With dead ends: 29456 [2020-07-20 15:01:23,208 INFO L226 Difference]: Without dead ends: 20045 [2020-07-20 15:01:23,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:23,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20045 states. [2020-07-20 15:01:23,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20045 to 20001. [2020-07-20 15:01:23,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20001 states. [2020-07-20 15:01:23,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20001 states to 20001 states and 32327 transitions. [2020-07-20 15:01:23,901 INFO L78 Accepts]: Start accepts. Automaton has 20001 states and 32327 transitions. Word has length 470 [2020-07-20 15:01:23,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:23,901 INFO L479 AbstractCegarLoop]: Abstraction has 20001 states and 32327 transitions. [2020-07-20 15:01:23,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:23,902 INFO L276 IsEmpty]: Start isEmpty. Operand 20001 states and 32327 transitions. [2020-07-20 15:01:23,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 15:01:23,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:23,934 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] [2020-07-20 15:01:24,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:24,144 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:24,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:24,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1777003357, now seen corresponding path program 1 times [2020-07-20 15:01:24,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:24,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760937892] [2020-07-20 15:01:24,147 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:24,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:01:24,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:24,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1431 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:01:24,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:24,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:24,820 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:24,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760937892] [2020-07-20 15:01:24,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:24,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:01:24,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057766941] [2020-07-20 15:01:24,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:01:24,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:24,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:01:24,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:01:24,823 INFO L87 Difference]: Start difference. First operand 20001 states and 32327 transitions. Second operand 4 states. [2020-07-20 15:01:26,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:26,734 INFO L93 Difference]: Finished difference Result 55373 states and 89008 transitions. [2020-07-20 15:01:26,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:01:26,735 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 470 [2020-07-20 15:01:26,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:26,784 INFO L225 Difference]: With dead ends: 55373 [2020-07-20 15:01:26,784 INFO L226 Difference]: Without dead ends: 37652 [2020-07-20 15:01:26,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:01:26,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37652 states. [2020-07-20 15:01:27,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37652 to 21294. [2020-07-20 15:01:27,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21294 states. [2020-07-20 15:01:27,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21294 states to 21294 states and 34606 transitions. [2020-07-20 15:01:27,923 INFO L78 Accepts]: Start accepts. Automaton has 21294 states and 34606 transitions. Word has length 470 [2020-07-20 15:01:27,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:27,924 INFO L479 AbstractCegarLoop]: Abstraction has 21294 states and 34606 transitions. [2020-07-20 15:01:27,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:01:27,924 INFO L276 IsEmpty]: Start isEmpty. Operand 21294 states and 34606 transitions. [2020-07-20 15:01:27,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 15:01:27,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:27,946 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] [2020-07-20 15:01:28,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:28,147 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:28,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:28,148 INFO L82 PathProgramCache]: Analyzing trace with hash -72931109, now seen corresponding path program 1 times [2020-07-20 15:01:28,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:28,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465228719] [2020-07-20 15:01:28,150 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:28,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:01:28,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:28,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:28,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:28,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:28,807 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:28,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465228719] [2020-07-20 15:01:28,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:28,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:28,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524200871] [2020-07-20 15:01:28,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:28,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:28,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:28,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:28,810 INFO L87 Difference]: Start difference. First operand 21294 states and 34606 transitions. Second operand 3 states. [2020-07-20 15:01:30,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:30,529 INFO L93 Difference]: Finished difference Result 56867 states and 91363 transitions. [2020-07-20 15:01:30,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:30,529 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 473 [2020-07-20 15:01:30,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:30,581 INFO L225 Difference]: With dead ends: 56867 [2020-07-20 15:01:30,581 INFO L226 Difference]: Without dead ends: 39095 [2020-07-20 15:01:30,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:30,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39095 states. [2020-07-20 15:01:31,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39095 to 21758. [2020-07-20 15:01:31,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21758 states. [2020-07-20 15:01:31,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21758 states to 21758 states and 35316 transitions. [2020-07-20 15:01:31,359 INFO L78 Accepts]: Start accepts. Automaton has 21758 states and 35316 transitions. Word has length 473 [2020-07-20 15:01:31,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:31,359 INFO L479 AbstractCegarLoop]: Abstraction has 21758 states and 35316 transitions. [2020-07-20 15:01:31,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:31,359 INFO L276 IsEmpty]: Start isEmpty. Operand 21758 states and 35316 transitions. [2020-07-20 15:01:31,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-20 15:01:31,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:31,377 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] [2020-07-20 15:01:31,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:31,587 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:31,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:31,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1995052696, now seen corresponding path program 1 times [2020-07-20 15:01:31,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:31,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544165264] [2020-07-20 15:01:31,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:32,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:01:32,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:32,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:01:32,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:32,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:32,230 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:32,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544165264] [2020-07-20 15:01:32,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:32,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:01:32,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374716558] [2020-07-20 15:01:32,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:01:32,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:32,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:01:32,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:01:32,232 INFO L87 Difference]: Start difference. First operand 21758 states and 35316 transitions. Second operand 4 states. [2020-07-20 15:01:33,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:33,372 INFO L93 Difference]: Finished difference Result 51271 states and 83469 transitions. [2020-07-20 15:01:33,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:01:33,372 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 474 [2020-07-20 15:01:33,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:33,411 INFO L225 Difference]: With dead ends: 51271 [2020-07-20 15:01:33,411 INFO L226 Difference]: Without dead ends: 26863 [2020-07-20 15:01:33,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:01:33,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26863 states. [2020-07-20 15:01:34,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26863 to 26819. [2020-07-20 15:01:34,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26819 states. [2020-07-20 15:01:34,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26819 states to 26819 states and 43620 transitions. [2020-07-20 15:01:34,593 INFO L78 Accepts]: Start accepts. Automaton has 26819 states and 43620 transitions. Word has length 474 [2020-07-20 15:01:34,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:34,593 INFO L479 AbstractCegarLoop]: Abstraction has 26819 states and 43620 transitions. [2020-07-20 15:01:34,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:01:34,593 INFO L276 IsEmpty]: Start isEmpty. Operand 26819 states and 43620 transitions. [2020-07-20 15:01:34,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 15:01:34,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:34,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:34,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:34,835 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:34,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:34,836 INFO L82 PathProgramCache]: Analyzing trace with hash -2045453381, now seen corresponding path program 1 times [2020-07-20 15:01:34,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:34,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052425043] [2020-07-20 15:01:34,837 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:35,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:35,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:35,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 1650 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:01:35,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:35,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:35,631 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:35,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052425043] [2020-07-20 15:01:35,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:35,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:01:35,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491106667] [2020-07-20 15:01:35,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:01:35,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:35,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:01:35,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:01:35,633 INFO L87 Difference]: Start difference. First operand 26819 states and 43620 transitions. Second operand 4 states. [2020-07-20 15:01:38,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:38,079 INFO L93 Difference]: Finished difference Result 78663 states and 127976 transitions. [2020-07-20 15:01:38,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:01:38,080 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 476 [2020-07-20 15:01:38,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:38,136 INFO L225 Difference]: With dead ends: 78663 [2020-07-20 15:01:38,136 INFO L226 Difference]: Without dead ends: 52583 [2020-07-20 15:01:38,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:01:38,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52583 states. [2020-07-20 15:01:40,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52583 to 52545. [2020-07-20 15:01:40,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52545 states. [2020-07-20 15:01:40,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52545 states to 52545 states and 85040 transitions. [2020-07-20 15:01:40,123 INFO L78 Accepts]: Start accepts. Automaton has 52545 states and 85040 transitions. Word has length 476 [2020-07-20 15:01:40,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:40,124 INFO L479 AbstractCegarLoop]: Abstraction has 52545 states and 85040 transitions. [2020-07-20 15:01:40,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:01:40,124 INFO L276 IsEmpty]: Start isEmpty. Operand 52545 states and 85040 transitions. [2020-07-20 15:01:40,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 15:01:40,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:40,183 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:40,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:40,397 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:40,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:40,398 INFO L82 PathProgramCache]: Analyzing trace with hash 892089167, now seen corresponding path program 1 times [2020-07-20 15:01:40,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:40,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286242740] [2020-07-20 15:01:40,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:40,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:40,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:40,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 1653 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:40,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:41,324 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 15:01:41,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:41,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286242740] [2020-07-20 15:01:41,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:41,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:41,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332856665] [2020-07-20 15:01:41,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:41,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:41,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:41,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:41,333 INFO L87 Difference]: Start difference. First operand 52545 states and 85040 transitions. Second operand 3 states. [2020-07-20 15:01:45,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:45,963 INFO L93 Difference]: Finished difference Result 151928 states and 245430 transitions. [2020-07-20 15:01:45,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:45,964 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-20 15:01:45,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:46,071 INFO L225 Difference]: With dead ends: 151928 [2020-07-20 15:01:46,071 INFO L226 Difference]: Without dead ends: 103269 [2020-07-20 15:01:46,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:46,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103269 states. [2020-07-20 15:01:49,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103269 to 103228. [2020-07-20 15:01:49,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103228 states. [2020-07-20 15:01:49,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103228 states to 103228 states and 166393 transitions. [2020-07-20 15:01:49,954 INFO L78 Accepts]: Start accepts. Automaton has 103228 states and 166393 transitions. Word has length 478 [2020-07-20 15:01:49,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:01:49,955 INFO L479 AbstractCegarLoop]: Abstraction has 103228 states and 166393 transitions. [2020-07-20 15:01:49,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:01:49,955 INFO L276 IsEmpty]: Start isEmpty. Operand 103228 states and 166393 transitions. [2020-07-20 15:01:50,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-20 15:01:50,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:01:50,037 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:01:50,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:50,238 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:01:50,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:01:50,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1439608733, now seen corresponding path program 1 times [2020-07-20 15:01:50,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:01:50,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031445285] [2020-07-20 15:01:50,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:01:50,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:01:50,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:01:50,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 1654 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:01:50,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:01:50,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:01:50,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:01:50,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031445285] [2020-07-20 15:01:50,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:01:50,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:01:50,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487681587] [2020-07-20 15:01:50,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:01:50,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:01:50,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:01:50,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:50,904 INFO L87 Difference]: Start difference. First operand 103228 states and 166393 transitions. Second operand 3 states. [2020-07-20 15:01:59,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:01:59,176 INFO L93 Difference]: Finished difference Result 304442 states and 490218 transitions. [2020-07-20 15:01:59,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:01:59,176 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-20 15:01:59,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:01:59,383 INFO L225 Difference]: With dead ends: 304442 [2020-07-20 15:01:59,383 INFO L226 Difference]: Without dead ends: 202318 [2020-07-20 15:01:59,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:01:59,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202318 states. [2020-07-20 15:02:03,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202318 to 103526. [2020-07-20 15:02:03,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103526 states. [2020-07-20 15:02:03,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103526 states to 103526 states and 166823 transitions. [2020-07-20 15:02:03,954 INFO L78 Accepts]: Start accepts. Automaton has 103526 states and 166823 transitions. Word has length 479 [2020-07-20 15:02:03,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:02:03,954 INFO L479 AbstractCegarLoop]: Abstraction has 103526 states and 166823 transitions. [2020-07-20 15:02:03,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:02:03,955 INFO L276 IsEmpty]: Start isEmpty. Operand 103526 states and 166823 transitions. [2020-07-20 15:02:04,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 481 [2020-07-20 15:02:04,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:02:04,045 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:02:04,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:02:04,246 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:02:04,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:02:04,247 INFO L82 PathProgramCache]: Analyzing trace with hash -861800310, now seen corresponding path program 1 times [2020-07-20 15:02:04,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:02:04,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359656638] [2020-07-20 15:02:04,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:02:04,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:02:04,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:02:04,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 1653 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:02:04,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:02:06,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:02:06,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:02:06,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359656638] [2020-07-20 15:02:06,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:02:06,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:02:06,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426038771] [2020-07-20 15:02:06,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:02:06,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:02:06,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:02:06,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:02:06,768 INFO L87 Difference]: Start difference. First operand 103526 states and 166823 transitions. Second operand 3 states. [2020-07-20 15:02:14,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:02:14,356 INFO L93 Difference]: Finished difference Result 304233 states and 489850 transitions. [2020-07-20 15:02:14,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:02:14,357 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 480 [2020-07-20 15:02:14,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:02:14,585 INFO L225 Difference]: With dead ends: 304233 [2020-07-20 15:02:14,585 INFO L226 Difference]: Without dead ends: 205034 [2020-07-20 15:02:14,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:02:14,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205034 states. [2020-07-20 15:02:26,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205034 to 204998. [2020-07-20 15:02:26,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204998 states. [2020-07-20 15:02:26,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204998 states to 204998 states and 328910 transitions. [2020-07-20 15:02:26,879 INFO L78 Accepts]: Start accepts. Automaton has 204998 states and 328910 transitions. Word has length 480 [2020-07-20 15:02:26,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:02:26,880 INFO L479 AbstractCegarLoop]: Abstraction has 204998 states and 328910 transitions. [2020-07-20 15:02:26,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:02:26,880 INFO L276 IsEmpty]: Start isEmpty. Operand 204998 states and 328910 transitions. [2020-07-20 15:02:27,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 481 [2020-07-20 15:02:27,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:02:27,058 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:02:27,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:02:27,267 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:02:27,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:02:27,268 INFO L82 PathProgramCache]: Analyzing trace with hash -630855857, now seen corresponding path program 1 times [2020-07-20 15:02:27,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:02:27,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897552951] [2020-07-20 15:02:27,269 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:02:27,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:02:27,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:02:27,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:02:27,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:02:27,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:02:27,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:02:27,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897552951] [2020-07-20 15:02:27,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:02:27,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:02:27,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11737477] [2020-07-20 15:02:27,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:02:27,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:02:27,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:02:27,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:02:27,807 INFO L87 Difference]: Start difference. First operand 204998 states and 328910 transitions. Second operand 3 states. [2020-07-20 15:02:46,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:02:46,714 INFO L93 Difference]: Finished difference Result 610824 states and 980002 transitions. [2020-07-20 15:02:46,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:02:46,715 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 480 [2020-07-20 15:02:46,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:02:47,183 INFO L225 Difference]: With dead ends: 610824 [2020-07-20 15:02:47,183 INFO L226 Difference]: Without dead ends: 407845 [2020-07-20 15:02:47,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:02:47,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407845 states. [2020-07-20 15:03:01,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407845 to 206164. [2020-07-20 15:03:01,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206164 states. [2020-07-20 15:03:02,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206164 states to 206164 states and 330538 transitions. [2020-07-20 15:03:02,229 INFO L78 Accepts]: Start accepts. Automaton has 206164 states and 330538 transitions. Word has length 480 [2020-07-20 15:03:02,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:02,229 INFO L479 AbstractCegarLoop]: Abstraction has 206164 states and 330538 transitions. [2020-07-20 15:03:02,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:02,229 INFO L276 IsEmpty]: Start isEmpty. Operand 206164 states and 330538 transitions. [2020-07-20 15:03:02,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-20 15:03:02,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:02,405 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] [2020-07-20 15:03:02,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:02,606 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:02,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:02,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1442310410, now seen corresponding path program 1 times [2020-07-20 15:03:02,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:02,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014663254] [2020-07-20 15:03:02,608 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:03,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:03,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:03,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:03,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:03,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:03,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:03,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014663254] [2020-07-20 15:03:03,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:03,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:03,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95573492] [2020-07-20 15:03:03,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:03,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:03,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:03,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:03,768 INFO L87 Difference]: Start difference. First operand 206164 states and 330538 transitions. Second operand 3 states. [2020-07-20 15:03:24,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:03:24,782 INFO L93 Difference]: Finished difference Result 612958 states and 982884 transitions. [2020-07-20 15:03:24,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:03:24,783 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-20 15:03:24,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:03:25,279 INFO L225 Difference]: With dead ends: 612958 [2020-07-20 15:03:25,279 INFO L226 Difference]: Without dead ends: 409473 [2020-07-20 15:03:25,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:25,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409473 states. [2020-07-20 15:03:43,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409473 to 207792. [2020-07-20 15:03:43,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207792 states. [2020-07-20 15:03:43,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207792 states to 207792 states and 332738 transitions. [2020-07-20 15:03:43,843 INFO L78 Accepts]: Start accepts. Automaton has 207792 states and 332738 transitions. Word has length 481 [2020-07-20 15:03:43,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:03:43,843 INFO L479 AbstractCegarLoop]: Abstraction has 207792 states and 332738 transitions. [2020-07-20 15:03:43,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:03:43,843 INFO L276 IsEmpty]: Start isEmpty. Operand 207792 states and 332738 transitions. [2020-07-20 15:03:44,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 15:03:44,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:03:44,012 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:03:44,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:44,213 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:03:44,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:03:44,214 INFO L82 PathProgramCache]: Analyzing trace with hash -47946267, now seen corresponding path program 1 times [2020-07-20 15:03:44,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:03:44,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48987855] [2020-07-20 15:03:44,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:03:44,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:03:44,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:03:44,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 1656 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:03:44,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:03:44,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:03:44,935 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:03:44,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48987855] [2020-07-20 15:03:44,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:03:44,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:03:44,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863376946] [2020-07-20 15:03:44,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:03:44,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:03:44,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:03:44,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:03:44,937 INFO L87 Difference]: Start difference. First operand 207792 states and 332738 transitions. Second operand 3 states. [2020-07-20 15:04:08,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:04:08,070 INFO L93 Difference]: Finished difference Result 596631 states and 953305 transitions. [2020-07-20 15:04:08,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:04:08,070 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 482 [2020-07-20 15:04:08,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:04:08,561 INFO L225 Difference]: With dead ends: 596631 [2020-07-20 15:04:08,561 INFO L226 Difference]: Without dead ends: 406649 [2020-07-20 15:04:08,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:04:09,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406649 states. [2020-07-20 15:04:37,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406649 to 406615. [2020-07-20 15:04:37,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 406615 states. [2020-07-20 15:04:38,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406615 states to 406615 states and 648106 transitions. [2020-07-20 15:04:38,089 INFO L78 Accepts]: Start accepts. Automaton has 406615 states and 648106 transitions. Word has length 482 [2020-07-20 15:04:38,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:04:38,089 INFO L479 AbstractCegarLoop]: Abstraction has 406615 states and 648106 transitions. [2020-07-20 15:04:38,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:04:38,089 INFO L276 IsEmpty]: Start isEmpty. Operand 406615 states and 648106 transitions. [2020-07-20 15:04:38,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 15:04:38,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:04:38,467 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:04:38,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:38,668 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:04:38,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:04:38,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1093829118, now seen corresponding path program 1 times [2020-07-20 15:04:38,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:04:38,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246115498] [2020-07-20 15:04:38,670 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:04:39,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:04:39,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:04:39,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 1447 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:04:39,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:04:39,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:04:39,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:04:39,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246115498] [2020-07-20 15:04:39,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:04:39,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:04:39,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249097889] [2020-07-20 15:04:39,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:04:39,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:04:39,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:04:39,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:04:39,270 INFO L87 Difference]: Start difference. First operand 406615 states and 648106 transitions. Second operand 4 states. [2020-07-20 15:05:23,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:05:23,394 INFO L93 Difference]: Finished difference Result 1005566 states and 1607099 transitions. [2020-07-20 15:05:23,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:05:23,395 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 482 [2020-07-20 15:05:23,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:05:24,122 INFO L225 Difference]: With dead ends: 1005566 [2020-07-20 15:05:24,123 INFO L226 Difference]: Without dead ends: 525070 [2020-07-20 15:05:24,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 15:05:24,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525070 states. [2020-07-20 15:06:01,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525070 to 525036. [2020-07-20 15:06:01,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 525036 states. [2020-07-20 15:06:02,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525036 states to 525036 states and 837936 transitions. [2020-07-20 15:06:02,864 INFO L78 Accepts]: Start accepts. Automaton has 525036 states and 837936 transitions. Word has length 482 [2020-07-20 15:06:02,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:06:02,864 INFO L479 AbstractCegarLoop]: Abstraction has 525036 states and 837936 transitions. [2020-07-20 15:06:02,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:06:02,864 INFO L276 IsEmpty]: Start isEmpty. Operand 525036 states and 837936 transitions. [2020-07-20 15:06:03,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-20 15:06:03,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:06:03,421 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:06:03,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:06:03,622 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:06:03,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:06:03,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1469360888, now seen corresponding path program 1 times [2020-07-20 15:06:03,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:06:03,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525543616] [2020-07-20 15:06:03,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:06:04,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:06:04,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:06:04,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:06:04,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:06:04,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:06:04,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:06:04,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525543616] [2020-07-20 15:06:04,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:06:04,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:06:04,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105757573] [2020-07-20 15:06:04,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:06:04,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:06:04,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:06:04,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:06:04,483 INFO L87 Difference]: Start difference. First operand 525036 states and 837936 transitions. Second operand 3 states. [2020-07-20 15:07:13,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:13,893 INFO L93 Difference]: Finished difference Result 1534425 states and 2448538 transitions. [2020-07-20 15:07:13,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:07:13,894 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-20 15:07:13,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:15,331 INFO L225 Difference]: With dead ends: 1534425 [2020-07-20 15:07:15,331 INFO L226 Difference]: Without dead ends: 1031442 [2020-07-20 15:07:15,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:07:16,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1031442 states. [2020-07-20 15:08:37,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1031442 to 1031422. [2020-07-20 15:08:37,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1031422 states. [2020-07-20 15:08:38,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1031422 states to 1031422 states and 1639697 transitions. [2020-07-20 15:08:38,924 INFO L78 Accepts]: Start accepts. Automaton has 1031422 states and 1639697 transitions. Word has length 483 [2020-07-20 15:08:38,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:38,924 INFO L479 AbstractCegarLoop]: Abstraction has 1031422 states and 1639697 transitions. [2020-07-20 15:08:38,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:38,924 INFO L276 IsEmpty]: Start isEmpty. Operand 1031422 states and 1639697 transitions. [2020-07-20 15:08:42,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 15:08:42,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:42,056 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] [2020-07-20 15:08:42,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:42,257 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:42,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:42,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1655658926, now seen corresponding path program 1 times [2020-07-20 15:08:42,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:42,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905163498] [2020-07-20 15:08:42,259 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:42,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:08:42,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:42,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1449 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:42,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:42,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:08:42,829 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:42,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905163498] [2020-07-20 15:08:42,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:42,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:42,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235080870] [2020-07-20 15:08:42,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:42,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:42,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:42,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:42,832 INFO L87 Difference]: Start difference. First operand 1031422 states and 1639697 transitions. Second operand 3 states. [2020-07-20 15:11:03,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:03,262 INFO L93 Difference]: Finished difference Result 2860792 states and 4517767 transitions. [2020-07-20 15:11:03,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:11:03,263 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-20 15:11:03,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:07,172 INFO L225 Difference]: With dead ends: 2860792 [2020-07-20 15:11:07,172 INFO L226 Difference]: Without dead ends: 1951791 [2020-07-20 15:11:07,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:11:09,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1951791 states.