/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:32:18,374 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:32:18,378 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:32:18,404 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:32:18,404 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:32:18,406 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:32:18,407 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:32:18,409 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:32:18,411 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:32:18,412 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:32:18,413 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:32:18,415 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:32:18,415 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:32:18,416 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:32:18,417 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:32:18,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:32:18,420 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:32:18,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:32:18,423 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:32:18,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:32:18,427 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:32:18,431 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:32:18,432 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:32:18,433 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:32:18,438 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:32:18,438 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:32:18,438 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:32:18,441 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:32:18,442 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:32:18,443 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 10:32:18,443 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:32:18,445 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:32:18,446 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:32:18,447 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:32:18,448 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:32:18,448 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:32:18,450 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:32:18,450 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:32:18,451 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:32:18,452 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:32:18,453 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:32:18,454 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:32:18,512 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:32:18,515 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:32:18,516 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:32:18,516 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:32:18,517 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:32:18,517 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:32:18,517 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:32:18,517 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:32:18,517 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:32:18,518 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:32:18,520 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:32:18,520 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:32:18,520 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:32:18,520 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:32:18,521 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:32:18,521 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:32:18,521 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:32:18,521 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:32:18,521 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:32:18,522 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:32:18,522 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:32:18,522 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:32:18,522 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:32:18,522 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:32:18,523 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:32:18,524 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:32:18,525 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:32:18,525 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:32:18,525 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:32:18,525 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:32:18,999 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:32:19,019 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:32:19,025 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:32:19,027 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:32:19,028 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:32:19,030 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-21 10:32:19,121 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/984bc61b3/41fbe80eb6a44c9f83e52b69dc26db45/FLAG92f449540 [2020-09-21 10:32:19,861 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:32:19,862 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-21 10:32:19,882 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/984bc61b3/41fbe80eb6a44c9f83e52b69dc26db45/FLAG92f449540 [2020-09-21 10:32:20,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/984bc61b3/41fbe80eb6a44c9f83e52b69dc26db45 [2020-09-21 10:32:20,028 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:32:20,034 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:32:20,035 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:32:20,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:32:20,040 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:32:20,041 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:20" (1/1) ... [2020-09-21 10:32:20,045 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d574d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:20, skipping insertion in model container [2020-09-21 10:32:20,045 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:32:20" (1/1) ... [2020-09-21 10:32:20,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:32:20,184 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:32:21,335 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:32:21,360 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:32:22,215 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:32:22,259 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:32:22,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22 WrapperNode [2020-09-21 10:32:22,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:32:22,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:32:22,263 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:32:22,263 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:32:22,290 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,350 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,351 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,449 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,481 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,490 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... [2020-09-21 10:32:22,505 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:32:22,506 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:32:22,506 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:32:22,506 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:32:22,508 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-21 10:32:22,625 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:32:22,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:32:22,626 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-21 10:32:22,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:32:22,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:32:22,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-21 10:32:22,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-09-21 10:32:22,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-09-21 10:32:22,629 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-09-21 10:32:22,629 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:32:22,629 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-21 10:32:22,631 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-09-21 10:32:22,631 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-09-21 10:32:22,631 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-09-21 10:32:22,631 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-09-21 10:32:22,633 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-09-21 10:32:22,633 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-09-21 10:32:22,633 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-21 10:32:22,634 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-09-21 10:32:22,634 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:32:22,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:32:22,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:32:25,556 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:32:25,557 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-21 10:32:25,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:25 BoogieIcfgContainer [2020-09-21 10:32:25,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:32:25,571 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:32:25,571 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:32:25,575 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:32:25,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:32:20" (1/3) ... [2020-09-21 10:32:25,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ce1c521 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:25, skipping insertion in model container [2020-09-21 10:32:25,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:32:22" (2/3) ... [2020-09-21 10:32:25,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ce1c521 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:32:25, skipping insertion in model container [2020-09-21 10:32:25,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:32:25" (3/3) ... [2020-09-21 10:32:25,579 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-09-21 10:32:25,592 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:32:25,603 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:32:25,626 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:32:25,666 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:32:25,667 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:32:25,667 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:32:25,667 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:32:25,667 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:32:25,667 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:32:25,667 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:32:25,668 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:32:25,706 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states. [2020-09-21 10:32:25,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-09-21 10:32:25,742 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:32:25,745 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] [2020-09-21 10:32:25,745 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:32:25,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:32:25,753 INFO L82 PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times [2020-09-21 10:32:25,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:32:25,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353900675] [2020-09-21 10:32:25,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:32:26,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:27,658 WARN L193 SmtUtils]: Spent 539.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:32:27,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:32:27,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:27,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:32:27,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353900675] [2020-09-21 10:32:27,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:32:27,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:32:27,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812707437] [2020-09-21 10:32:27,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:32:27,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:32:27,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:32:27,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:32:27,890 INFO L87 Difference]: Start difference. First operand 796 states. Second operand 4 states. [2020-09-21 10:32:28,419 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-09-21 10:32:34,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:32:34,020 INFO L93 Difference]: Finished difference Result 1515 states and 2659 transitions. [2020-09-21 10:32:34,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:32:34,023 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-09-21 10:32:34,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:32:34,056 INFO L225 Difference]: With dead ends: 1515 [2020-09-21 10:32:34,056 INFO L226 Difference]: Without dead ends: 1299 [2020-09-21 10:32:34,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:32:34,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1299 states. [2020-09-21 10:32:34,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1299 to 1297. [2020-09-21 10:32:34,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1297 states. [2020-09-21 10:32:34,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1297 states to 1297 states and 2028 transitions. [2020-09-21 10:32:34,211 INFO L78 Accepts]: Start accepts. Automaton has 1297 states and 2028 transitions. Word has length 318 [2020-09-21 10:32:34,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:32:34,216 INFO L479 AbstractCegarLoop]: Abstraction has 1297 states and 2028 transitions. [2020-09-21 10:32:34,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:32:34,216 INFO L276 IsEmpty]: Start isEmpty. Operand 1297 states and 2028 transitions. [2020-09-21 10:32:34,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-09-21 10:32:34,228 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:32:34,229 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] [2020-09-21 10:32:34,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:32:34,229 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:32:34,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:32:34,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1367796252, now seen corresponding path program 1 times [2020-09-21 10:32:34,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:32:34,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347670983] [2020-09-21 10:32:34,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:32:34,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:35,413 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:32:35,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:32:35,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:35,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:32:35,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347670983] [2020-09-21 10:32:35,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:32:35,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:32:35,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241854281] [2020-09-21 10:32:35,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:32:35,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:32:35,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:32:35,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:32:35,683 INFO L87 Difference]: Start difference. First operand 1297 states and 2028 transitions. Second operand 4 states. [2020-09-21 10:32:36,237 WARN L193 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-09-21 10:32:41,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:32:41,260 INFO L93 Difference]: Finished difference Result 2671 states and 4201 transitions. [2020-09-21 10:32:41,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:32:41,261 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-09-21 10:32:41,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:32:41,278 INFO L225 Difference]: With dead ends: 2671 [2020-09-21 10:32:41,278 INFO L226 Difference]: Without dead ends: 2289 [2020-09-21 10:32:41,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:32:41,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2289 states. [2020-09-21 10:32:41,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2287. [2020-09-21 10:32:41,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2287 states. [2020-09-21 10:32:41,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2287 states to 2287 states and 3564 transitions. [2020-09-21 10:32:41,383 INFO L78 Accepts]: Start accepts. Automaton has 2287 states and 3564 transitions. Word has length 318 [2020-09-21 10:32:41,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:32:41,384 INFO L479 AbstractCegarLoop]: Abstraction has 2287 states and 3564 transitions. [2020-09-21 10:32:41,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:32:41,384 INFO L276 IsEmpty]: Start isEmpty. Operand 2287 states and 3564 transitions. [2020-09-21 10:32:41,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-09-21 10:32:41,393 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:32:41,393 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:32:41,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:32:41,398 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:32:41,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:32:41,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1797025293, now seen corresponding path program 1 times [2020-09-21 10:32:41,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:32:41,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852355543] [2020-09-21 10:32:41,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:32:41,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:42,478 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:32:42,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:32:42,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:42,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:32:42,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852355543] [2020-09-21 10:32:42,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:32:42,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:32:42,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033238448] [2020-09-21 10:32:42,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:32:42,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:32:42,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:32:42,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:32:42,638 INFO L87 Difference]: Start difference. First operand 2287 states and 3564 transitions. Second operand 4 states. [2020-09-21 10:32:43,127 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-09-21 10:32:47,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:32:47,626 INFO L93 Difference]: Finished difference Result 4943 states and 7762 transitions. [2020-09-21 10:32:47,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:32:47,626 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-09-21 10:32:47,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:32:47,649 INFO L225 Difference]: With dead ends: 4943 [2020-09-21 10:32:47,649 INFO L226 Difference]: Without dead ends: 4229 [2020-09-21 10:32:47,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:32:47,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4229 states. [2020-09-21 10:32:47,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 4227. [2020-09-21 10:32:47,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4227 states. [2020-09-21 10:32:47,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4227 states to 4227 states and 6568 transitions. [2020-09-21 10:32:47,778 INFO L78 Accepts]: Start accepts. Automaton has 4227 states and 6568 transitions. Word has length 318 [2020-09-21 10:32:47,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:32:47,779 INFO L479 AbstractCegarLoop]: Abstraction has 4227 states and 6568 transitions. [2020-09-21 10:32:47,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:32:47,780 INFO L276 IsEmpty]: Start isEmpty. Operand 4227 states and 6568 transitions. [2020-09-21 10:32:47,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-09-21 10:32:47,792 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:32:47,792 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] [2020-09-21 10:32:47,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:32:47,793 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:32:47,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:32:47,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1914723175, now seen corresponding path program 1 times [2020-09-21 10:32:47,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:32:47,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965638512] [2020-09-21 10:32:47,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:32:48,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:48,752 WARN L193 SmtUtils]: Spent 456.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:32:48,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:32:48,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:48,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:32:48,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965638512] [2020-09-21 10:32:48,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:32:48,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:32:48,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352537381] [2020-09-21 10:32:48,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:32:48,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:32:48,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:32:48,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:32:48,933 INFO L87 Difference]: Start difference. First operand 4227 states and 6568 transitions. Second operand 4 states. [2020-09-21 10:32:49,486 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-09-21 10:32:53,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:32:53,911 INFO L93 Difference]: Finished difference Result 9359 states and 14670 transitions. [2020-09-21 10:32:53,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:32:53,913 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-09-21 10:32:53,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:32:53,950 INFO L225 Difference]: With dead ends: 9359 [2020-09-21 10:32:53,950 INFO L226 Difference]: Without dead ends: 8029 [2020-09-21 10:32:53,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:32:53,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8029 states. [2020-09-21 10:32:54,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8029 to 8027. [2020-09-21 10:32:54,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8027 states. [2020-09-21 10:32:54,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8027 states to 8027 states and 12440 transitions. [2020-09-21 10:32:54,213 INFO L78 Accepts]: Start accepts. Automaton has 8027 states and 12440 transitions. Word has length 318 [2020-09-21 10:32:54,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:32:54,214 INFO L479 AbstractCegarLoop]: Abstraction has 8027 states and 12440 transitions. [2020-09-21 10:32:54,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:32:54,215 INFO L276 IsEmpty]: Start isEmpty. Operand 8027 states and 12440 transitions. [2020-09-21 10:32:54,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-09-21 10:32:54,232 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:32:54,232 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] [2020-09-21 10:32:54,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:32:54,233 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:32:54,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:32:54,234 INFO L82 PathProgramCache]: Analyzing trace with hash 769893352, now seen corresponding path program 1 times [2020-09-21 10:32:54,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:32:54,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [54669081] [2020-09-21 10:32:54,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:32:54,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:55,310 WARN L193 SmtUtils]: Spent 514.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:32:55,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:32:55,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:32:55,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:32:55,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [54669081] [2020-09-21 10:32:55,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:32:55,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:32:55,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900825791] [2020-09-21 10:32:55,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:32:55,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:32:55,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:32:55,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:32:55,487 INFO L87 Difference]: Start difference. First operand 8027 states and 12440 transitions. Second operand 5 states. [2020-09-21 10:33:02,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:33:02,949 INFO L93 Difference]: Finished difference Result 23754 states and 36777 transitions. [2020-09-21 10:33:02,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:33:02,950 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 318 [2020-09-21 10:33:02,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:33:03,005 INFO L225 Difference]: With dead ends: 23754 [2020-09-21 10:33:03,005 INFO L226 Difference]: Without dead ends: 15742 [2020-09-21 10:33:03,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:33:03,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15742 states. [2020-09-21 10:33:03,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15742 to 15740. [2020-09-21 10:33:03,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15740 states. [2020-09-21 10:33:03,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15740 states to 15740 states and 24254 transitions. [2020-09-21 10:33:03,440 INFO L78 Accepts]: Start accepts. Automaton has 15740 states and 24254 transitions. Word has length 318 [2020-09-21 10:33:03,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:33:03,440 INFO L479 AbstractCegarLoop]: Abstraction has 15740 states and 24254 transitions. [2020-09-21 10:33:03,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:33:03,441 INFO L276 IsEmpty]: Start isEmpty. Operand 15740 states and 24254 transitions. [2020-09-21 10:33:03,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-09-21 10:33:03,471 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:33:03,471 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] [2020-09-21 10:33:03,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:33:03,472 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:33:03,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:33:03,477 INFO L82 PathProgramCache]: Analyzing trace with hash -685152901, now seen corresponding path program 1 times [2020-09-21 10:33:03,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:33:03,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685276199] [2020-09-21 10:33:03,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:33:03,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:33:04,286 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-09-21 10:33:04,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:33:04,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:33:04,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:33:04,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685276199] [2020-09-21 10:33:04,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:33:04,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:33:04,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238280878] [2020-09-21 10:33:04,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:33:04,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:33:04,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:33:04,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:33:04,577 INFO L87 Difference]: Start difference. First operand 15740 states and 24254 transitions. Second operand 4 states. [2020-09-21 10:33:13,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:33:13,403 INFO L93 Difference]: Finished difference Result 46481 states and 71518 transitions. [2020-09-21 10:33:13,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:33:13,404 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 320 [2020-09-21 10:33:13,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:33:13,465 INFO L225 Difference]: With dead ends: 46481 [2020-09-21 10:33:13,465 INFO L226 Difference]: Without dead ends: 30870 [2020-09-21 10:33:13,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:33:13,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30870 states. [2020-09-21 10:33:14,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30870 to 30868. [2020-09-21 10:33:14,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30868 states. [2020-09-21 10:33:14,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30868 states to 30868 states and 47285 transitions. [2020-09-21 10:33:14,250 INFO L78 Accepts]: Start accepts. Automaton has 30868 states and 47285 transitions. Word has length 320 [2020-09-21 10:33:14,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:33:14,250 INFO L479 AbstractCegarLoop]: Abstraction has 30868 states and 47285 transitions. [2020-09-21 10:33:14,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:33:14,251 INFO L276 IsEmpty]: Start isEmpty. Operand 30868 states and 47285 transitions. [2020-09-21 10:33:14,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-09-21 10:33:14,297 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:33:14,297 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] [2020-09-21 10:33:14,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:33:14,298 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:33:14,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:33:14,298 INFO L82 PathProgramCache]: Analyzing trace with hash -810813248, now seen corresponding path program 1 times [2020-09-21 10:33:14,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:33:14,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389153258] [2020-09-21 10:33:14,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:33:14,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat