/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:59:21,589 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:59:21,592 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:59:21,607 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:59:21,607 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:59:21,608 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:59:21,610 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:59:21,612 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:59:21,613 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:59:21,614 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:59:21,615 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:59:21,617 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:59:21,617 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:59:21,618 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:59:21,619 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:59:21,621 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:59:21,622 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:59:21,623 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:59:21,625 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:59:21,628 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:59:21,630 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:59:21,631 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:59:21,632 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:59:21,634 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:59:21,636 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 23:59:21,637 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 23:59:21,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 23:59:21,638 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 23:59:21,638 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 23:59:21,639 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 23:59:21,640 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 23:59:21,640 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 23:59:21,641 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 23:59:21,642 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 23:59:21,643 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 23:59:21,643 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 23:59:21,644 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 23:59:21,644 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 23:59:21,644 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:59:21,645 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:59:21,646 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:59:21,647 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:59:21,662 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:59:21,663 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:59:21,664 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:59:21,664 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:59:21,664 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:59:21,665 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:59:21,665 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:59:21,665 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:59:21,665 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:59:21,665 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:59:21,665 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:59:21,666 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:59:21,666 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:59:21,666 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:59:21,666 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:59:21,666 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:59:21,667 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:59:21,667 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:59:21,667 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:59:21,667 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:59:21,667 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:59:21,668 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:59:21,668 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:59:21,668 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:59:21,668 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:59:21,668 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:59:21,669 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:21,669 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:59:21,669 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:59:21,669 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:59:21,967 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:59:21,987 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:59:21,991 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:59:21,992 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:59:21,995 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:59:21,997 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:59:22,074 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e517f84d3/0ea3126dfeef4c79a3d17982abf5c2b3/FLAG99ca84af2 [2020-07-21 23:59:22,797 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:59:22,798 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:59:22,820 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e517f84d3/0ea3126dfeef4c79a3d17982abf5c2b3/FLAG99ca84af2 [2020-07-21 23:59:22,999 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e517f84d3/0ea3126dfeef4c79a3d17982abf5c2b3 [2020-07-21 23:59:23,006 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:59:23,009 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:59:23,010 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:59:23,010 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:59:23,014 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:59:23,015 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:59:23" (1/1) ... [2020-07-21 23:59:23,018 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e9ca9ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:23, skipping insertion in model container [2020-07-21 23:59:23,018 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:59:23" (1/1) ... [2020-07-21 23:59:23,025 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:59:23,199 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:59:24,666 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:59:24,683 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:59:25,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:59:26,020 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:59:26,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26 WrapperNode [2020-07-21 23:59:26,020 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:59:26,021 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:59:26,021 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:59:26,022 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:59:26,033 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,073 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,074 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,147 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,200 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... [2020-07-21 23:59:26,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:59:26,226 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:59:26,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:59:26,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:59:26,228 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:59:26,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:59:26,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:59:26,309 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:59:26,309 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:59:26,309 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:59:26,310 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 23:59:26,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 23:59:26,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:59:26,311 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 23:59:26,311 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:59:26,312 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:59:26,313 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 23:59:26,313 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 23:59:26,313 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 23:59:26,313 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 23:59:26,314 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 23:59:26,314 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 23:59:26,315 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 23:59:26,315 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 23:59:26,315 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 23:59:26,315 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:59:26,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:59:26,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:59:30,954 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:59:30,955 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 23:59:30,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:59:30 BoogieIcfgContainer [2020-07-21 23:59:30,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:59:30,969 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:59:30,969 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:59:30,973 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:59:30,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:59:23" (1/3) ... [2020-07-21 23:59:30,974 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338ae55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:59:30, skipping insertion in model container [2020-07-21 23:59:30,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:59:26" (2/3) ... [2020-07-21 23:59:30,974 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338ae55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:59:30, skipping insertion in model container [2020-07-21 23:59:30,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:59:30" (3/3) ... [2020-07-21 23:59:30,976 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:59:30,988 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:59:30,997 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:59:31,012 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:59:31,042 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:59:31,042 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:59:31,042 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:59:31,042 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:59:31,042 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:59:31,042 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:59:31,043 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:59:31,043 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:59:31,083 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-07-21 23:59:31,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 23:59:31,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:31,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:31,136 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:31,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:31,143 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-07-21 23:59:31,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:31,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610255347] [2020-07-21 23:59:31,153 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 [2020-07-21 23:59:31,770 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:31,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:31,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:59:31,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:32,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:32,302 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:32,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610255347] [2020-07-21 23:59:32,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:32,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:59:32,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088146900] [2020-07-21 23:59:32,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:59:32,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:32,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:59:32,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:59:32,330 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 4 states. [2020-07-21 23:59:32,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:32,888 INFO L93 Difference]: Finished difference Result 4291 states and 7727 transitions. [2020-07-21 23:59:32,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:59:32,890 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-21 23:59:32,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:32,933 INFO L225 Difference]: With dead ends: 4291 [2020-07-21 23:59:32,934 INFO L226 Difference]: Without dead ends: 2849 [2020-07-21 23:59:32,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:59:32,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2849 states. [2020-07-21 23:59:33,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2849 to 2847. [2020-07-21 23:59:33,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2847 states. [2020-07-21 23:59:33,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2847 states to 2847 states and 4683 transitions. [2020-07-21 23:59:33,182 INFO L78 Accepts]: Start accepts. Automaton has 2847 states and 4683 transitions. Word has length 496 [2020-07-21 23:59:33,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:33,188 INFO L479 AbstractCegarLoop]: Abstraction has 2847 states and 4683 transitions. [2020-07-21 23:59:33,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:59:33,188 INFO L276 IsEmpty]: Start isEmpty. Operand 2847 states and 4683 transitions. [2020-07-21 23:59:33,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-21 23:59:33,206 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:33,207 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:33,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:33,421 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:33,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:33,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1861665862, now seen corresponding path program 1 times [2020-07-21 23:59:33,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:33,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479214612] [2020-07-21 23:59:33,422 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:33,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:33,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:33,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 2119 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:33,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:34,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:34,192 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:34,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479214612] [2020-07-21 23:59:34,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:34,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:34,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943236918] [2020-07-21 23:59:34,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:34,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:34,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:34,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:34,209 INFO L87 Difference]: Start difference. First operand 2847 states and 4683 transitions. Second operand 3 states. [2020-07-21 23:59:34,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:34,501 INFO L93 Difference]: Finished difference Result 8232 states and 13497 transitions. [2020-07-21 23:59:34,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:34,502 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-21 23:59:34,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:34,531 INFO L225 Difference]: With dead ends: 8232 [2020-07-21 23:59:34,531 INFO L226 Difference]: Without dead ends: 5614 [2020-07-21 23:59:34,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:34,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5614 states. [2020-07-21 23:59:34,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5614 to 5612. [2020-07-21 23:59:34,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5612 states. [2020-07-21 23:59:34,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5612 states to 5612 states and 9200 transitions. [2020-07-21 23:59:34,732 INFO L78 Accepts]: Start accepts. Automaton has 5612 states and 9200 transitions. Word has length 498 [2020-07-21 23:59:34,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:34,733 INFO L479 AbstractCegarLoop]: Abstraction has 5612 states and 9200 transitions. [2020-07-21 23:59:34,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:34,733 INFO L276 IsEmpty]: Start isEmpty. Operand 5612 states and 9200 transitions. [2020-07-21 23:59:34,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 23:59:34,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:34,749 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:34,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:34,964 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:34,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:34,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1909603127, now seen corresponding path program 1 times [2020-07-21 23:59:34,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:34,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404537649] [2020-07-21 23:59:34,967 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 [2020-07-21 23:59:35,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:35,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:35,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 1731 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:35,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:35,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:35,510 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:35,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404537649] [2020-07-21 23:59:35,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:35,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:35,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919401956] [2020-07-21 23:59:35,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:35,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:35,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:35,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:35,513 INFO L87 Difference]: Start difference. First operand 5612 states and 9200 transitions. Second operand 3 states. [2020-07-21 23:59:35,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:35,933 INFO L93 Difference]: Finished difference Result 16580 states and 27137 transitions. [2020-07-21 23:59:35,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:35,933 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 23:59:35,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:35,986 INFO L225 Difference]: With dead ends: 16580 [2020-07-21 23:59:35,987 INFO L226 Difference]: Without dead ends: 10999 [2020-07-21 23:59:35,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:36,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10999 states. [2020-07-21 23:59:36,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10999 to 5638. [2020-07-21 23:59:36,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5638 states. [2020-07-21 23:59:36,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5638 states to 5638 states and 9238 transitions. [2020-07-21 23:59:36,283 INFO L78 Accepts]: Start accepts. Automaton has 5638 states and 9238 transitions. Word has length 499 [2020-07-21 23:59:36,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:36,283 INFO L479 AbstractCegarLoop]: Abstraction has 5638 states and 9238 transitions. [2020-07-21 23:59:36,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:36,284 INFO L276 IsEmpty]: Start isEmpty. Operand 5638 states and 9238 transitions. [2020-07-21 23:59:36,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 23:59:36,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:36,300 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:36,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:36,516 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:36,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:36,516 INFO L82 PathProgramCache]: Analyzing trace with hash -609208427, now seen corresponding path program 1 times [2020-07-21 23:59:36,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:36,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027739710] [2020-07-21 23:59:36,517 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 [2020-07-21 23:59:36,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:36,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:36,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 1730 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:59:36,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:37,130 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:37,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027739710] [2020-07-21 23:59:37,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:37,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:59:37,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377172525] [2020-07-21 23:59:37,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:59:37,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:37,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:59:37,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:59:37,133 INFO L87 Difference]: Start difference. First operand 5638 states and 9238 transitions. Second operand 4 states. [2020-07-21 23:59:37,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:37,580 INFO L93 Difference]: Finished difference Result 13306 states and 21986 transitions. [2020-07-21 23:59:37,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:59:37,581 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 500 [2020-07-21 23:59:37,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:37,630 INFO L225 Difference]: With dead ends: 13306 [2020-07-21 23:59:37,630 INFO L226 Difference]: Without dead ends: 6729 [2020-07-21 23:59:37,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:59:37,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6729 states. [2020-07-21 23:59:37,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6729 to 6727. [2020-07-21 23:59:37,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6727 states. [2020-07-21 23:59:37,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6727 states to 6727 states and 11081 transitions. [2020-07-21 23:59:37,909 INFO L78 Accepts]: Start accepts. Automaton has 6727 states and 11081 transitions. Word has length 500 [2020-07-21 23:59:37,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:37,910 INFO L479 AbstractCegarLoop]: Abstraction has 6727 states and 11081 transitions. [2020-07-21 23:59:37,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:59:37,911 INFO L276 IsEmpty]: Start isEmpty. Operand 6727 states and 11081 transitions. [2020-07-21 23:59:37,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 23:59:37,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:37,930 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:38,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:38,144 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:38,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:38,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1856068473, now seen corresponding path program 1 times [2020-07-21 23:59:38,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:38,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669008115] [2020-07-21 23:59:38,147 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:38,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:38,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:38,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 2123 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:38,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:39,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:39,287 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:39,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669008115] [2020-07-21 23:59:39,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:39,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:39,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522573050] [2020-07-21 23:59:39,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:39,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:39,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:39,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:39,290 INFO L87 Difference]: Start difference. First operand 6727 states and 11081 transitions. Second operand 3 states. [2020-07-21 23:59:39,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:39,625 INFO L93 Difference]: Finished difference Result 12122 states and 19636 transitions. [2020-07-21 23:59:39,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:39,626 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 23:59:39,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:39,649 INFO L225 Difference]: With dead ends: 12122 [2020-07-21 23:59:39,650 INFO L226 Difference]: Without dead ends: 8633 [2020-07-21 23:59:39,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:39,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8633 states. [2020-07-21 23:59:39,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8633 to 7543. [2020-07-21 23:59:39,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7543 states. [2020-07-21 23:59:39,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7543 states to 7543 states and 12422 transitions. [2020-07-21 23:59:39,918 INFO L78 Accepts]: Start accepts. Automaton has 7543 states and 12422 transitions. Word has length 502 [2020-07-21 23:59:39,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:39,918 INFO L479 AbstractCegarLoop]: Abstraction has 7543 states and 12422 transitions. [2020-07-21 23:59:39,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:39,919 INFO L276 IsEmpty]: Start isEmpty. Operand 7543 states and 12422 transitions. [2020-07-21 23:59:39,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 23:59:39,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:39,937 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:40,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:40,153 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:40,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:40,153 INFO L82 PathProgramCache]: Analyzing trace with hash 2111871510, now seen corresponding path program 1 times [2020-07-21 23:59:40,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:40,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381678349] [2020-07-21 23:59:40,154 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 [2020-07-21 23:59:40,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:40,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:40,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 2119 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:40,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:40,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:40,961 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:40,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381678349] [2020-07-21 23:59:40,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:40,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:40,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604356147] [2020-07-21 23:59:40,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:40,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:40,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:40,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:40,964 INFO L87 Difference]: Start difference. First operand 7543 states and 12422 transitions. Second operand 3 states. [2020-07-21 23:59:41,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:41,462 INFO L93 Difference]: Finished difference Result 22110 states and 36369 transitions. [2020-07-21 23:59:41,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:41,463 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 23:59:41,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:41,508 INFO L225 Difference]: With dead ends: 22110 [2020-07-21 23:59:41,508 INFO L226 Difference]: Without dead ends: 14943 [2020-07-21 23:59:41,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:41,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14943 states. [2020-07-21 23:59:42,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14943 to 14941. [2020-07-21 23:59:42,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14941 states. [2020-07-21 23:59:42,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14941 states to 14941 states and 24519 transitions. [2020-07-21 23:59:42,204 INFO L78 Accepts]: Start accepts. Automaton has 14941 states and 24519 transitions. Word has length 502 [2020-07-21 23:59:42,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:42,205 INFO L479 AbstractCegarLoop]: Abstraction has 14941 states and 24519 transitions. [2020-07-21 23:59:42,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:42,205 INFO L276 IsEmpty]: Start isEmpty. Operand 14941 states and 24519 transitions. [2020-07-21 23:59:42,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 23:59:42,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:42,230 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:42,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:42,445 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:42,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:42,445 INFO L82 PathProgramCache]: Analyzing trace with hash 105142257, now seen corresponding path program 1 times [2020-07-21 23:59:42,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:42,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782948938] [2020-07-21 23:59:42,446 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 [2020-07-21 23:59:42,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:42,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:42,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 1733 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:42,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:42,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:42,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782948938] [2020-07-21 23:59:42,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:42,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:42,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470502732] [2020-07-21 23:59:42,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:42,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:42,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:42,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:42,946 INFO L87 Difference]: Start difference. First operand 14941 states and 24519 transitions. Second operand 3 states. [2020-07-21 23:59:43,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:43,675 INFO L93 Difference]: Finished difference Result 44542 states and 73082 transitions. [2020-07-21 23:59:43,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:43,676 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-21 23:59:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:43,763 INFO L225 Difference]: With dead ends: 44542 [2020-07-21 23:59:43,764 INFO L226 Difference]: Without dead ends: 29738 [2020-07-21 23:59:43,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:43,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29738 states. [2020-07-21 23:59:44,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29738 to 15034. [2020-07-21 23:59:44,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15034 states. [2020-07-21 23:59:44,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15034 states to 15034 states and 24660 transitions. [2020-07-21 23:59:44,428 INFO L78 Accepts]: Start accepts. Automaton has 15034 states and 24660 transitions. Word has length 502 [2020-07-21 23:59:44,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:44,429 INFO L479 AbstractCegarLoop]: Abstraction has 15034 states and 24660 transitions. [2020-07-21 23:59:44,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:44,429 INFO L276 IsEmpty]: Start isEmpty. Operand 15034 states and 24660 transitions. [2020-07-21 23:59:44,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-21 23:59:44,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:44,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:44,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:44,647 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:44,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:44,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1234824133, now seen corresponding path program 1 times [2020-07-21 23:59:44,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:44,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261351393] [2020-07-21 23:59:44,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:44,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:44,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:44,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 1730 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:44,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:45,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:45,234 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:45,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261351393] [2020-07-21 23:59:45,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:45,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:45,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396986449] [2020-07-21 23:59:45,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:45,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:45,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:45,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:45,236 INFO L87 Difference]: Start difference. First operand 15034 states and 24660 transitions. Second operand 3 states. [2020-07-21 23:59:45,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:45,783 INFO L93 Difference]: Finished difference Result 44158 states and 72386 transitions. [2020-07-21 23:59:45,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:45,784 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-21 23:59:45,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:45,847 INFO L225 Difference]: With dead ends: 44158 [2020-07-21 23:59:45,847 INFO L226 Difference]: Without dead ends: 29610 [2020-07-21 23:59:45,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:45,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29610 states. [2020-07-21 23:59:46,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29610 to 15186. [2020-07-21 23:59:46,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15186 states. [2020-07-21 23:59:46,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15186 states to 15186 states and 24884 transitions. [2020-07-21 23:59:46,624 INFO L78 Accepts]: Start accepts. Automaton has 15186 states and 24884 transitions. Word has length 503 [2020-07-21 23:59:46,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:46,624 INFO L479 AbstractCegarLoop]: Abstraction has 15186 states and 24884 transitions. [2020-07-21 23:59:46,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:46,624 INFO L276 IsEmpty]: Start isEmpty. Operand 15186 states and 24884 transitions. [2020-07-21 23:59:46,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-21 23:59:46,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:46,643 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:47,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:47,366 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:47,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:47,368 INFO L82 PathProgramCache]: Analyzing trace with hash 406815726, now seen corresponding path program 1 times [2020-07-21 23:59:47,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:47,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434884714] [2020-07-21 23:59:47,369 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:47,733 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:47,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:47,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:47,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:47,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:47,886 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:47,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434884714] [2020-07-21 23:59:47,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:47,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:47,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45203913] [2020-07-21 23:59:47,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:47,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:47,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:47,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:47,891 INFO L87 Difference]: Start difference. First operand 15186 states and 24884 transitions. Second operand 3 states. [2020-07-21 23:59:49,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:49,155 INFO L93 Difference]: Finished difference Result 45169 states and 73994 transitions. [2020-07-21 23:59:49,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:49,156 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-21 23:59:49,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:49,207 INFO L225 Difference]: With dead ends: 45169 [2020-07-21 23:59:49,208 INFO L226 Difference]: Without dead ends: 30174 [2020-07-21 23:59:49,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:49,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30174 states. [2020-07-21 23:59:50,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30174 to 15318. [2020-07-21 23:59:50,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15318 states. [2020-07-21 23:59:50,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15318 states to 15318 states and 25055 transitions. [2020-07-21 23:59:50,071 INFO L78 Accepts]: Start accepts. Automaton has 15318 states and 25055 transitions. Word has length 503 [2020-07-21 23:59:50,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:50,071 INFO L479 AbstractCegarLoop]: Abstraction has 15318 states and 25055 transitions. [2020-07-21 23:59:50,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:50,072 INFO L276 IsEmpty]: Start isEmpty. Operand 15318 states and 25055 transitions. [2020-07-21 23:59:50,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 23:59:50,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:50,087 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:50,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:50,288 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:50,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:50,289 INFO L82 PathProgramCache]: Analyzing trace with hash -504006859, now seen corresponding path program 1 times [2020-07-21 23:59:50,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:50,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299217859] [2020-07-21 23:59:50,290 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 [2020-07-21 23:59:50,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:50,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:50,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 2117 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:50,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:50,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:50,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:50,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299217859] [2020-07-21 23:59:50,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:50,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:50,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912034391] [2020-07-21 23:59:50,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:50,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:50,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:50,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:50,945 INFO L87 Difference]: Start difference. First operand 15318 states and 25055 transitions. Second operand 3 states. [2020-07-21 23:59:51,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:51,873 INFO L93 Difference]: Finished difference Result 43536 states and 71074 transitions. [2020-07-21 23:59:51,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:51,874 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 23:59:51,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:51,911 INFO L225 Difference]: With dead ends: 43536 [2020-07-21 23:59:51,911 INFO L226 Difference]: Without dead ends: 29762 [2020-07-21 23:59:51,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:51,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29762 states. [2020-07-21 23:59:52,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29762 to 29760. [2020-07-21 23:59:52,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29760 states. [2020-07-21 23:59:52,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29760 states to 29760 states and 48490 transitions. [2020-07-21 23:59:52,847 INFO L78 Accepts]: Start accepts. Automaton has 29760 states and 48490 transitions. Word has length 504 [2020-07-21 23:59:52,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:52,848 INFO L479 AbstractCegarLoop]: Abstraction has 29760 states and 48490 transitions. [2020-07-21 23:59:52,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:52,848 INFO L276 IsEmpty]: Start isEmpty. Operand 29760 states and 48490 transitions. [2020-07-21 23:59:52,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 23:59:52,872 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:52,873 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:53,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:53,074 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:53,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:53,075 INFO L82 PathProgramCache]: Analyzing trace with hash 59569345, now seen corresponding path program 1 times [2020-07-21 23:59:53,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:53,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269764204] [2020-07-21 23:59:53,076 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 [2020-07-21 23:59:53,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:53,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:53,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 2121 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:53,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:53,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:53,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:53,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269764204] [2020-07-21 23:59:53,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:53,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:53,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615773184] [2020-07-21 23:59:53,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:53,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:53,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:53,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:53,914 INFO L87 Difference]: Start difference. First operand 29760 states and 48490 transitions. Second operand 3 states. [2020-07-21 23:59:55,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:55,032 INFO L93 Difference]: Finished difference Result 55604 states and 89780 transitions. [2020-07-21 23:59:55,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:55,032 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 23:59:55,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:55,081 INFO L225 Difference]: With dead ends: 55604 [2020-07-21 23:59:55,081 INFO L226 Difference]: Without dead ends: 39458 [2020-07-21 23:59:55,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:55,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39458 states. [2020-07-21 23:59:57,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39458 to 35488. [2020-07-21 23:59:57,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35488 states. [2020-07-21 23:59:57,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35488 states to 35488 states and 57922 transitions. [2020-07-21 23:59:57,250 INFO L78 Accepts]: Start accepts. Automaton has 35488 states and 57922 transitions. Word has length 504 [2020-07-21 23:59:57,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:57,251 INFO L479 AbstractCegarLoop]: Abstraction has 35488 states and 57922 transitions. [2020-07-21 23:59:57,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:57,251 INFO L276 IsEmpty]: Start isEmpty. Operand 35488 states and 57922 transitions. [2020-07-21 23:59:57,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 23:59:57,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:57,282 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:59:57,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:57,495 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:57,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:57,496 INFO L82 PathProgramCache]: Analyzing trace with hash -129707110, now seen corresponding path program 1 times [2020-07-21 23:59:57,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:57,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323427257] [2020-07-21 23:59:57,497 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 [2020-07-21 23:59:57,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:57,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:57,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:59:57,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:58,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:58,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:58,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323427257] [2020-07-21 23:59:58,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:58,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:59:58,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894602132] [2020-07-21 23:59:58,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:59:58,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:58,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:59:58,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:59:58,276 INFO L87 Difference]: Start difference. First operand 35488 states and 57922 transitions. Second operand 5 states. [2020-07-22 00:00:00,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:00,473 INFO L93 Difference]: Finished difference Result 57998 states and 93739 transitions. [2020-07-22 00:00:00,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-22 00:00:00,474 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 505 [2020-07-22 00:00:00,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:00,517 INFO L225 Difference]: With dead ends: 57998 [2020-07-22 00:00:00,517 INFO L226 Difference]: Without dead ends: 35488 [2020-07-22 00:00:00,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-22 00:00:00,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35488 states. [2020-07-22 00:00:01,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35488 to 35488. [2020-07-22 00:00:01,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35488 states. [2020-07-22 00:00:02,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35488 states to 35488 states and 57614 transitions. [2020-07-22 00:00:02,276 INFO L78 Accepts]: Start accepts. Automaton has 35488 states and 57614 transitions. Word has length 505 [2020-07-22 00:00:02,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:02,276 INFO L479 AbstractCegarLoop]: Abstraction has 35488 states and 57614 transitions. [2020-07-22 00:00:02,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-22 00:00:02,276 INFO L276 IsEmpty]: Start isEmpty. Operand 35488 states and 57614 transitions. [2020-07-22 00:00:02,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-22 00:00:02,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:02,301 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:00:02,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:02,502 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:02,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:02,503 INFO L82 PathProgramCache]: Analyzing trace with hash -558897505, now seen corresponding path program 1 times [2020-07-22 00:00:02,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:02,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545437937] [2020-07-22 00:00:02,503 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 [2020-07-22 00:00:02,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:00:02,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:02,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 2127 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:00:02,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:03,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:03,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:03,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545437937] [2020-07-22 00:00:03,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:03,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:00:03,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247521108] [2020-07-22 00:00:03,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:00:03,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:00:03,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:00:03,156 INFO L87 Difference]: Start difference. First operand 35488 states and 57614 transitions. Second operand 4 states. [2020-07-22 00:00:06,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:06,851 INFO L93 Difference]: Finished difference Result 104814 states and 170325 transitions. [2020-07-22 00:00:06,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:00:06,851 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-22 00:00:06,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:06,930 INFO L225 Difference]: With dead ends: 104814 [2020-07-22 00:00:06,930 INFO L226 Difference]: Without dead ends: 69767 [2020-07-22 00:00:06,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:00:07,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69767 states. [2020-07-22 00:00:09,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69767 to 69712. [2020-07-22 00:00:09,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69712 states. [2020-07-22 00:00:09,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69712 states to 69712 states and 112820 transitions. [2020-07-22 00:00:09,619 INFO L78 Accepts]: Start accepts. Automaton has 69712 states and 112820 transitions. Word has length 505 [2020-07-22 00:00:09,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:09,620 INFO L479 AbstractCegarLoop]: Abstraction has 69712 states and 112820 transitions. [2020-07-22 00:00:09,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:00:09,620 INFO L276 IsEmpty]: Start isEmpty. Operand 69712 states and 112820 transitions. [2020-07-22 00:00:09,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-22 00:00:09,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:09,659 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:00:09,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:09,860 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:09,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:09,861 INFO L82 PathProgramCache]: Analyzing trace with hash -7423292, now seen corresponding path program 1 times [2020-07-22 00:00:09,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:09,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328159952] [2020-07-22 00:00:09,862 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 [2020-07-22 00:00:10,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:00:10,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:10,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 1733 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-22 00:00:10,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:10,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:10,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:10,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328159952] [2020-07-22 00:00:10,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:10,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:00:10,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744574353] [2020-07-22 00:00:10,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:00:10,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:10,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:00:10,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:10,397 INFO L87 Difference]: Start difference. First operand 69712 states and 112820 transitions. Second operand 3 states. [2020-07-22 00:00:16,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:16,940 INFO L93 Difference]: Finished difference Result 201189 states and 325088 transitions. [2020-07-22 00:00:16,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:00:16,940 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-22 00:00:16,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:17,085 INFO L225 Difference]: With dead ends: 201189 [2020-07-22 00:00:17,085 INFO L226 Difference]: Without dead ends: 131703 [2020-07-22 00:00:17,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:17,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131703 states. [2020-07-22 00:00:20,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131703 to 69195. [2020-07-22 00:00:20,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69195 states. [2020-07-22 00:00:20,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69195 states to 69195 states and 111990 transitions. [2020-07-22 00:00:20,428 INFO L78 Accepts]: Start accepts. Automaton has 69195 states and 111990 transitions. Word has length 506 [2020-07-22 00:00:20,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:20,429 INFO L479 AbstractCegarLoop]: Abstraction has 69195 states and 111990 transitions. [2020-07-22 00:00:20,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:00:20,429 INFO L276 IsEmpty]: Start isEmpty. Operand 69195 states and 111990 transitions. [2020-07-22 00:00:20,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-22 00:00:20,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:20,476 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:00:20,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:20,677 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:20,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:20,678 INFO L82 PathProgramCache]: Analyzing trace with hash 2119082250, now seen corresponding path program 1 times [2020-07-22 00:00:20,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:20,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246660248] [2020-07-22 00:00:20,679 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 [2020-07-22 00:00:21,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:00:21,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:21,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-22 00:00:21,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:21,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:21,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:21,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246660248] [2020-07-22 00:00:21,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:21,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:00:21,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194447124] [2020-07-22 00:00:21,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:00:21,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:21,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:00:21,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:21,283 INFO L87 Difference]: Start difference. First operand 69195 states and 111990 transitions. Second operand 3 states. [2020-07-22 00:00:28,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:28,191 INFO L93 Difference]: Finished difference Result 200941 states and 324804 transitions. [2020-07-22 00:00:28,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:00:28,192 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-22 00:00:28,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:28,354 INFO L225 Difference]: With dead ends: 200941 [2020-07-22 00:00:28,354 INFO L226 Difference]: Without dead ends: 135147 [2020-07-22 00:00:28,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:28,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135147 states. [2020-07-22 00:00:36,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135147 to 135145. [2020-07-22 00:00:36,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135145 states. [2020-07-22 00:00:37,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135145 states to 135145 states and 217780 transitions. [2020-07-22 00:00:37,062 INFO L78 Accepts]: Start accepts. Automaton has 135145 states and 217780 transitions. Word has length 507 [2020-07-22 00:00:37,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:37,062 INFO L479 AbstractCegarLoop]: Abstraction has 135145 states and 217780 transitions. [2020-07-22 00:00:37,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:00:37,062 INFO L276 IsEmpty]: Start isEmpty. Operand 135145 states and 217780 transitions. [2020-07-22 00:00:37,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-22 00:00:37,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:37,164 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:00:37,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:37,366 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:37,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:37,367 INFO L82 PathProgramCache]: Analyzing trace with hash 474239812, now seen corresponding path program 1 times [2020-07-22 00:00:37,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:37,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362743659] [2020-07-22 00:00:37,368 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 [2020-07-22 00:00:37,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:00:37,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:37,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 1734 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-22 00:00:37,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:37,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:37,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362743659] [2020-07-22 00:00:37,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:37,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:00:37,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47965074] [2020-07-22 00:00:37,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:00:37,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:37,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:00:37,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:37,876 INFO L87 Difference]: Start difference. First operand 135145 states and 217780 transitions. Second operand 3 states. [2020-07-22 00:00:51,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:51,038 INFO L93 Difference]: Finished difference Result 401134 states and 646031 transitions. [2020-07-22 00:00:51,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:00:51,039 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-22 00:00:51,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:51,386 INFO L225 Difference]: With dead ends: 401134 [2020-07-22 00:00:51,386 INFO L226 Difference]: Without dead ends: 266704 [2020-07-22 00:00:51,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:00:51,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266704 states. [2020-07-22 00:00:59,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266704 to 134905. [2020-07-22 00:00:59,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134905 states. [2020-07-22 00:00:59,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134905 states to 134905 states and 217385 transitions. [2020-07-22 00:00:59,434 INFO L78 Accepts]: Start accepts. Automaton has 134905 states and 217385 transitions. Word has length 507 [2020-07-22 00:00:59,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:59,435 INFO L479 AbstractCegarLoop]: Abstraction has 134905 states and 217385 transitions. [2020-07-22 00:00:59,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:00:59,435 INFO L276 IsEmpty]: Start isEmpty. Operand 134905 states and 217385 transitions. [2020-07-22 00:00:59,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-22 00:00:59,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:59,527 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:00:59,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:59,728 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:59,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:59,729 INFO L82 PathProgramCache]: Analyzing trace with hash 409248422, now seen corresponding path program 1 times [2020-07-22 00:00:59,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:59,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636591813] [2020-07-22 00:00:59,730 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 [2020-07-22 00:01:00,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:01:00,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:01:00,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-22 00:01:00,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:01:00,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:01:00,304 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:01:00,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636591813] [2020-07-22 00:01:00,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:01:00,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:01:00,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108607859] [2020-07-22 00:01:00,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:01:00,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:01:00,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:01:00,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:01:00,317 INFO L87 Difference]: Start difference. First operand 134905 states and 217385 transitions. Second operand 4 states. [2020-07-22 00:01:14,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:01:14,357 INFO L93 Difference]: Finished difference Result 388857 states and 624301 transitions. [2020-07-22 00:01:14,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:01:14,358 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 508 [2020-07-22 00:01:14,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:01:14,735 INFO L225 Difference]: With dead ends: 388857 [2020-07-22 00:01:14,735 INFO L226 Difference]: Without dead ends: 264247 [2020-07-22 00:01:14,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:01:15,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264247 states. [2020-07-22 00:01:24,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264247 to 143097. [2020-07-22 00:01:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143097 states. [2020-07-22 00:01:24,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143097 states to 143097 states and 231715 transitions. [2020-07-22 00:01:24,223 INFO L78 Accepts]: Start accepts. Automaton has 143097 states and 231715 transitions. Word has length 508 [2020-07-22 00:01:24,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:01:24,224 INFO L479 AbstractCegarLoop]: Abstraction has 143097 states and 231715 transitions. [2020-07-22 00:01:24,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:01:24,224 INFO L276 IsEmpty]: Start isEmpty. Operand 143097 states and 231715 transitions. [2020-07-22 00:01:24,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-22 00:01:24,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:01:24,325 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:01:27,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:01:27,098 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:01:27,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:01:27,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1720422449, now seen corresponding path program 1 times [2020-07-22 00:01:27,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:01:27,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422851728] [2020-07-22 00:01:27,100 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 [2020-07-22 00:01:27,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:01:27,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:01:27,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:01:27,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:01:27,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:01:27,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:01:27,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422851728] [2020-07-22 00:01:27,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:01:27,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:01:27,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548278559] [2020-07-22 00:01:27,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:01:27,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:01:27,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:01:27,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:01:27,619 INFO L87 Difference]: Start difference. First operand 143097 states and 231715 transitions. Second operand 4 states. [2020-07-22 00:01:36,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:01:36,933 INFO L93 Difference]: Finished difference Result 332960 states and 541798 transitions. [2020-07-22 00:01:36,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:01:36,933 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 509 [2020-07-22 00:01:36,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:01:37,145 INFO L225 Difference]: With dead ends: 332960 [2020-07-22 00:01:37,145 INFO L226 Difference]: Without dead ends: 171438 [2020-07-22 00:01:37,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:01:37,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171438 states. [2020-07-22 00:01:49,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171438 to 171334. [2020-07-22 00:01:49,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171334 states. [2020-07-22 00:01:49,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171334 states to 171334 states and 278194 transitions. [2020-07-22 00:01:49,789 INFO L78 Accepts]: Start accepts. Automaton has 171334 states and 278194 transitions. Word has length 509 [2020-07-22 00:01:49,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:01:49,790 INFO L479 AbstractCegarLoop]: Abstraction has 171334 states and 278194 transitions. [2020-07-22 00:01:49,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:01:49,790 INFO L276 IsEmpty]: Start isEmpty. Operand 171334 states and 278194 transitions. [2020-07-22 00:01:49,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-22 00:01:49,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:01:49,920 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:01:50,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:01:50,133 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:01:50,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:01:50,134 INFO L82 PathProgramCache]: Analyzing trace with hash -892785757, now seen corresponding path program 1 times [2020-07-22 00:01:50,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:01:50,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778070509] [2020-07-22 00:01:50,135 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 [2020-07-22 00:01:50,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:01:50,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:01:50,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-22 00:01:50,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:01:51,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:01:51,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:01:51,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778070509] [2020-07-22 00:01:51,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:01:51,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:01:51,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13492923] [2020-07-22 00:01:51,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:01:51,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:01:51,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:01:51,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:01:51,036 INFO L87 Difference]: Start difference. First operand 171334 states and 278194 transitions. Second operand 4 states. [2020-07-22 00:02:11,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:02:11,581 INFO L93 Difference]: Finished difference Result 468605 states and 755899 transitions. [2020-07-22 00:02:11,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:02:11,582 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 510 [2020-07-22 00:02:11,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:02:11,981 INFO L225 Difference]: With dead ends: 468605 [2020-07-22 00:02:11,981 INFO L226 Difference]: Without dead ends: 320887 [2020-07-22 00:02:12,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:02:12,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320887 states. [2020-07-22 00:02:24,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320887 to 189932. [2020-07-22 00:02:24,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189932 states. [2020-07-22 00:02:24,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189932 states to 189932 states and 309805 transitions. [2020-07-22 00:02:24,653 INFO L78 Accepts]: Start accepts. Automaton has 189932 states and 309805 transitions. Word has length 510 [2020-07-22 00:02:24,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:02:24,653 INFO L479 AbstractCegarLoop]: Abstraction has 189932 states and 309805 transitions. [2020-07-22 00:02:24,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:02:24,653 INFO L276 IsEmpty]: Start isEmpty. Operand 189932 states and 309805 transitions. [2020-07-22 00:02:24,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-22 00:02:24,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:02:24,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:02:25,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:02:25,007 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:02:25,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:02:25,008 INFO L82 PathProgramCache]: Analyzing trace with hash -349826152, now seen corresponding path program 1 times [2020-07-22 00:02:25,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:02:25,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925196662] [2020-07-22 00:02:25,009 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 [2020-07-22 00:02:25,422 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:02:25,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:02:25,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-22 00:02:25,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:02:25,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:02:25,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:02:25,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925196662] [2020-07-22 00:02:25,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:02:25,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:02:25,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459063164] [2020-07-22 00:02:25,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:02:25,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:02:25,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:02:25,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:02:25,625 INFO L87 Difference]: Start difference. First operand 189932 states and 309805 transitions. Second operand 3 states. [2020-07-22 00:02:47,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:02:47,464 INFO L93 Difference]: Finished difference Result 527154 states and 854409 transitions. [2020-07-22 00:02:47,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:02:47,465 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 510 [2020-07-22 00:02:47,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:02:47,934 INFO L225 Difference]: With dead ends: 527154 [2020-07-22 00:02:47,934 INFO L226 Difference]: Without dead ends: 362783 [2020-07-22 00:02:48,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 508 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:02:48,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362783 states. [2020-07-22 00:03:16,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362783 to 362781. [2020-07-22 00:03:16,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 362781 states. [2020-07-22 00:03:17,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362781 states to 362781 states and 587686 transitions. [2020-07-22 00:03:17,306 INFO L78 Accepts]: Start accepts. Automaton has 362781 states and 587686 transitions. Word has length 510 [2020-07-22 00:03:17,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:03:17,307 INFO L479 AbstractCegarLoop]: Abstraction has 362781 states and 587686 transitions. [2020-07-22 00:03:17,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:03:17,307 INFO L276 IsEmpty]: Start isEmpty. Operand 362781 states and 587686 transitions. [2020-07-22 00:03:17,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 514 [2020-07-22 00:03:17,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:03:17,594 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:03:17,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:03:17,803 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:03:17,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:03:17,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1196365985, now seen corresponding path program 1 times [2020-07-22 00:03:17,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:03:17,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409801113] [2020-07-22 00:03:17,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:03:18,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:03:18,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:03:18,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 2128 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-22 00:03:18,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:03:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:03:18,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:03:18,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409801113] [2020-07-22 00:03:18,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:03:18,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:03:18,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916970985] [2020-07-22 00:03:18,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:03:18,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:03:18,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:03:18,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:03:18,422 INFO L87 Difference]: Start difference. First operand 362781 states and 587686 transitions. Second operand 3 states. [2020-07-22 00:04:07,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:04:07,967 INFO L93 Difference]: Finished difference Result 1017381 states and 1640479 transitions. [2020-07-22 00:04:07,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:04:07,967 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 513 [2020-07-22 00:04:07,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:04:09,184 INFO L225 Difference]: With dead ends: 1017381 [2020-07-22 00:04:09,184 INFO L226 Difference]: Without dead ends: 705097 [2020-07-22 00:04:09,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:04:10,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705097 states. [2020-07-22 00:05:04,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705097 to 705095. [2020-07-22 00:05:04,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 705095 states. [2020-07-22 00:05:05,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 705095 states to 705095 states and 1136355 transitions. [2020-07-22 00:05:05,815 INFO L78 Accepts]: Start accepts. Automaton has 705095 states and 1136355 transitions. Word has length 513 [2020-07-22 00:05:05,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:05:05,815 INFO L479 AbstractCegarLoop]: Abstraction has 705095 states and 1136355 transitions. [2020-07-22 00:05:05,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:05:05,815 INFO L276 IsEmpty]: Start isEmpty. Operand 705095 states and 1136355 transitions. [2020-07-22 00:05:06,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 515 [2020-07-22 00:05:06,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:05:06,586 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-22 00:05:06,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:05:06,787 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:05:06,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:05:06,788 INFO L82 PathProgramCache]: Analyzing trace with hash 149757933, now seen corresponding path program 1 times [2020-07-22 00:05:06,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:05:06,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687021513] [2020-07-22 00:05:06,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:05:07,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:05:07,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:05:07,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 2134 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:05:07,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:05:16,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:05:16,892 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:05:16,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687021513] [2020-07-22 00:05:16,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:05:16,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:05:16,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063670277] [2020-07-22 00:05:16,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:05:16,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:05:16,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:05:16,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:05:16,894 INFO L87 Difference]: Start difference. First operand 705095 states and 1136355 transitions. Second operand 4 states. [2020-07-22 00:07:03,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:07:03,397 INFO L93 Difference]: Finished difference Result 2091240 states and 3369476 transitions. [2020-07-22 00:07:03,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:07:03,398 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 514 [2020-07-22 00:07:03,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:07:06,056 INFO L225 Difference]: With dead ends: 2091240 [2020-07-22 00:07:06,056 INFO L226 Difference]: Without dead ends: 1392472 [2020-07-22 00:07:08,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:07:09,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1392472 states.