/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.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 10:42:32,370 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 10:42:32,373 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 10:42:32,399 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 10:42:32,399 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 10:42:32,400 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 10:42:32,402 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 10:42:32,403 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 10:42:32,405 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 10:42:32,406 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 10:42:32,407 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 10:42:32,408 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 10:42:32,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 10:42:32,409 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 10:42:32,410 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 10:42:32,411 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 10:42:32,412 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 10:42:32,413 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 10:42:32,415 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 10:42:32,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 10:42:32,418 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 10:42:32,419 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 10:42:32,420 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 10:42:32,421 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 10:42:32,424 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 10:42:32,424 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 10:42:32,424 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 10:42:32,425 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 10:42:32,426 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 10:42:32,427 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 10:42:32,427 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 10:42:32,428 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 10:42:32,431 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 10:42:32,432 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 10:42:32,433 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 10:42:32,433 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 10:42:32,437 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 10:42:32,437 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 10:42:32,438 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 10:42:32,438 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 10:42:32,441 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 10:42:32,442 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 [2020-08-18 10:42:32,489 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 10:42:32,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 10:42:32,491 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 10:42:32,491 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 10:42:32,492 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 10:42:32,492 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 10:42:32,492 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 10:42:32,492 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 10:42:32,492 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 10:42:32,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 10:42:32,495 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 10:42:32,495 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 10:42:32,495 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 10:42:32,496 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 10:42:32,496 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 10:42:32,496 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 10:42:32,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 10:42:32,496 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 10:42:32,497 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 10:42:32,498 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 [2020-08-18 10:42:32,851 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 10:42:32,873 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 10:42:32,878 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 10:42:32,880 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 10:42:32,882 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 10:42:32,883 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:32,960 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8a7cfdde0/b17aad9f5de64081ba6faa74abe3b855/FLAGe474a16b7 [2020-08-18 10:42:33,654 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 10:42:33,655 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:33,679 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8a7cfdde0/b17aad9f5de64081ba6faa74abe3b855/FLAGe474a16b7 [2020-08-18 10:42:33,815 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8a7cfdde0/b17aad9f5de64081ba6faa74abe3b855 [2020-08-18 10:42:33,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 10:42:33,824 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 10:42:33,825 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 10:42:33,826 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 10:42:33,829 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 10:42:33,830 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:42:33" (1/1) ... [2020-08-18 10:42:33,834 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6179954 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:33, skipping insertion in model container [2020-08-18 10:42:33,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:42:33" (1/1) ... [2020-08-18 10:42:33,842 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 10:42:33,959 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 10:42:35,079 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:42:35,095 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 10:42:35,637 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 10:42:35,678 INFO L208 MainTranslator]: Completed translation [2020-08-18 10:42:35,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35 WrapperNode [2020-08-18 10:42:35,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 10:42:35,681 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 10:42:35,681 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 10:42:35,682 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 10:42:35,698 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,756 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,863 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,899 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,913 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (1/1) ... [2020-08-18 10:42:35,938 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 10:42:35,941 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 10:42:35,941 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 10:42:35,941 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 10:42:35,943 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (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 [2020-08-18 10:42:36,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 10:42:36,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 10:42:36,056 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 10:42:36,056 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 10:42:36,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 10:42:36,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 10:42:36,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 10:42:36,058 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 10:42:36,058 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 10:42:36,058 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 10:42:36,058 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 10:42:36,059 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 10:42:36,059 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 10:42:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 10:42:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 10:42:36,061 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 10:42:36,061 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 10:42:36,061 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 10:42:36,062 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 10:42:36,062 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 10:42:36,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 10:42:36,063 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 10:42:38,693 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 10:42:38,693 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 10:42:38,708 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:42:38 BoogieIcfgContainer [2020-08-18 10:42:38,708 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 10:42:38,713 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 10:42:38,713 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 10:42:38,716 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 10:42:38,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:42:33" (1/3) ... [2020-08-18 10:42:38,718 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f4335bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:42:38, skipping insertion in model container [2020-08-18 10:42:38,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:42:35" (2/3) ... [2020-08-18 10:42:38,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f4335bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:42:38, skipping insertion in model container [2020-08-18 10:42:38,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:42:38" (3/3) ... [2020-08-18 10:42:38,721 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 10:42:38,732 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 10:42:38,743 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 10:42:38,759 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 10:42:38,792 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 10:42:38,793 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 10:42:38,793 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 10:42:38,793 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 10:42:38,793 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 10:42:38,794 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 10:42:38,794 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 10:42:38,794 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 10:42:38,835 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states. [2020-08-18 10:42:38,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-08-18 10:42:38,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:38,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:42:38,877 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:38,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:38,883 INFO L82 PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times [2020-08-18 10:42:38,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:38,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716275628] [2020-08-18 10:42:38,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:39,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:40,505 WARN L193 SmtUtils]: Spent 544.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:40,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:40,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:40,730 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:40,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716275628] [2020-08-18 10:42:40,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:40,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:40,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618266901] [2020-08-18 10:42:40,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:40,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:40,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:40,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:40,758 INFO L87 Difference]: Start difference. First operand 789 states. Second operand 4 states. [2020-08-18 10:42:41,218 WARN L193 SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:46,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:46,259 INFO L93 Difference]: Finished difference Result 1489 states and 2621 transitions. [2020-08-18 10:42:46,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:46,261 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-08-18 10:42:46,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:46,303 INFO L225 Difference]: With dead ends: 1489 [2020-08-18 10:42:46,303 INFO L226 Difference]: Without dead ends: 1273 [2020-08-18 10:42:46,314 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 [2020-08-18 10:42:46,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1273 states. [2020-08-18 10:42:46,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 1271. [2020-08-18 10:42:46,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1271 states. [2020-08-18 10:42:46,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1271 states to 1271 states and 1978 transitions. [2020-08-18 10:42:46,493 INFO L78 Accepts]: Start accepts. Automaton has 1271 states and 1978 transitions. Word has length 326 [2020-08-18 10:42:46,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:46,498 INFO L479 AbstractCegarLoop]: Abstraction has 1271 states and 1978 transitions. [2020-08-18 10:42:46,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:46,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1271 states and 1978 transitions. [2020-08-18 10:42:46,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-08-18 10:42:46,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:46,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:42:46,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 10:42:46,507 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:46,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:46,508 INFO L82 PathProgramCache]: Analyzing trace with hash 420377409, now seen corresponding path program 1 times [2020-08-18 10:42:46,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:46,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454529682] [2020-08-18 10:42:46,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:46,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:47,419 WARN L193 SmtUtils]: Spent 444.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:47,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:47,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:47,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:47,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454529682] [2020-08-18 10:42:47,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:47,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:47,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478734785] [2020-08-18 10:42:47,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:47,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:47,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:47,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:47,717 INFO L87 Difference]: Start difference. First operand 1271 states and 1978 transitions. Second operand 4 states. [2020-08-18 10:42:48,340 WARN L193 SmtUtils]: Spent 565.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:52,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:52,717 INFO L93 Difference]: Finished difference Result 2607 states and 4089 transitions. [2020-08-18 10:42:52,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:52,718 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-08-18 10:42:52,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:52,738 INFO L225 Difference]: With dead ends: 2607 [2020-08-18 10:42:52,739 INFO L226 Difference]: Without dead ends: 2225 [2020-08-18 10:42:52,750 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 [2020-08-18 10:42:52,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2225 states. [2020-08-18 10:42:52,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 2223. [2020-08-18 10:42:52,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2223 states. [2020-08-18 10:42:52,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 3452 transitions. [2020-08-18 10:42:52,881 INFO L78 Accepts]: Start accepts. Automaton has 2223 states and 3452 transitions. Word has length 326 [2020-08-18 10:42:52,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:52,882 INFO L479 AbstractCegarLoop]: Abstraction has 2223 states and 3452 transitions. [2020-08-18 10:42:52,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:52,882 INFO L276 IsEmpty]: Start isEmpty. Operand 2223 states and 3452 transitions. [2020-08-18 10:42:52,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-08-18 10:42:52,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:52,898 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:42:52,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 10:42:52,903 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:52,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:52,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1550523160, now seen corresponding path program 1 times [2020-08-18 10:42:52,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:52,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335820137] [2020-08-18 10:42:52,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:53,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:54,046 WARN L193 SmtUtils]: Spent 529.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:42:54,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:42:54,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:42:54,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:42:54,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335820137] [2020-08-18 10:42:54,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:42:54,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:42:54,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918084245] [2020-08-18 10:42:54,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:42:54,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:42:54,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:42:54,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:42:54,205 INFO L87 Difference]: Start difference. First operand 2223 states and 3452 transitions. Second operand 4 states. [2020-08-18 10:42:54,766 WARN L193 SmtUtils]: Spent 521.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 10:42:58,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:42:58,853 INFO L93 Difference]: Finished difference Result 4715 states and 7386 transitions. [2020-08-18 10:42:58,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:42:58,854 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-08-18 10:42:58,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:42:58,876 INFO L225 Difference]: With dead ends: 4715 [2020-08-18 10:42:58,877 INFO L226 Difference]: Without dead ends: 4049 [2020-08-18 10:42:58,879 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 [2020-08-18 10:42:58,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4049 states. [2020-08-18 10:42:59,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4049 to 4047. [2020-08-18 10:42:59,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4047 states. [2020-08-18 10:42:59,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4047 states to 4047 states and 6268 transitions. [2020-08-18 10:42:59,024 INFO L78 Accepts]: Start accepts. Automaton has 4047 states and 6268 transitions. Word has length 326 [2020-08-18 10:42:59,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:42:59,025 INFO L479 AbstractCegarLoop]: Abstraction has 4047 states and 6268 transitions. [2020-08-18 10:42:59,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:42:59,026 INFO L276 IsEmpty]: Start isEmpty. Operand 4047 states and 6268 transitions. [2020-08-18 10:42:59,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-08-18 10:42:59,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:42:59,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:42:59,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 10:42:59,037 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:42:59,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:42:59,037 INFO L82 PathProgramCache]: Analyzing trace with hash 405693337, now seen corresponding path program 1 times [2020-08-18 10:42:59,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:42:59,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510572967] [2020-08-18 10:42:59,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:42:59,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:00,006 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:00,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:00,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:00,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:00,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510572967] [2020-08-18 10:43:00,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:00,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 10:43:00,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290921143] [2020-08-18 10:43:00,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 10:43:00,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:00,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 10:43:00,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 10:43:00,253 INFO L87 Difference]: Start difference. First operand 4047 states and 6268 transitions. Second operand 5 states. [2020-08-18 10:43:06,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:06,999 INFO L93 Difference]: Finished difference Result 11998 states and 18565 transitions. [2020-08-18 10:43:07,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 10:43:07,000 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 326 [2020-08-18 10:43:07,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:07,037 INFO L225 Difference]: With dead ends: 11998 [2020-08-18 10:43:07,038 INFO L226 Difference]: Without dead ends: 7966 [2020-08-18 10:43:07,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 10:43:07,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7966 states. [2020-08-18 10:43:07,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7966 to 7964. [2020-08-18 10:43:07,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7964 states. [2020-08-18 10:43:07,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7964 states to 7964 states and 12270 transitions. [2020-08-18 10:43:07,426 INFO L78 Accepts]: Start accepts. Automaton has 7964 states and 12270 transitions. Word has length 326 [2020-08-18 10:43:07,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:07,427 INFO L479 AbstractCegarLoop]: Abstraction has 7964 states and 12270 transitions. [2020-08-18 10:43:07,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 10:43:07,427 INFO L276 IsEmpty]: Start isEmpty. Operand 7964 states and 12270 transitions. [2020-08-18 10:43:07,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-08-18 10:43:07,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:07,453 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:43:07,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 10:43:07,454 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:07,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:07,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1396966584, now seen corresponding path program 1 times [2020-08-18 10:43:07,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:07,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910843688] [2020-08-18 10:43:07,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:07,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:08,100 WARN L193 SmtUtils]: Spent 364.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:08,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:08,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:08,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:08,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910843688] [2020-08-18 10:43:08,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:08,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:08,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364911881] [2020-08-18 10:43:08,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:08,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:08,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:08,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:08,286 INFO L87 Difference]: Start difference. First operand 7964 states and 12270 transitions. Second operand 4 states. [2020-08-18 10:43:15,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:15,936 INFO L93 Difference]: Finished difference Result 23441 states and 36046 transitions. [2020-08-18 10:43:15,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:43:15,937 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 328 [2020-08-18 10:43:15,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:15,996 INFO L225 Difference]: With dead ends: 23441 [2020-08-18 10:43:15,996 INFO L226 Difference]: Without dead ends: 15606 [2020-08-18 10:43:16,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:16,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15606 states. [2020-08-18 10:43:16,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15606 to 15604. [2020-08-18 10:43:16,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15604 states. [2020-08-18 10:43:16,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15604 states to 15604 states and 23893 transitions. [2020-08-18 10:43:16,644 INFO L78 Accepts]: Start accepts. Automaton has 15604 states and 23893 transitions. Word has length 328 [2020-08-18 10:43:16,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:16,644 INFO L479 AbstractCegarLoop]: Abstraction has 15604 states and 23893 transitions. [2020-08-18 10:43:16,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:43:16,645 INFO L276 IsEmpty]: Start isEmpty. Operand 15604 states and 23893 transitions. [2020-08-18 10:43:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-08-18 10:43:16,677 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:16,677 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 10:43:16,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 10:43:16,678 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:16,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:16,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1164802445, now seen corresponding path program 1 times [2020-08-18 10:43:16,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:16,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537818158] [2020-08-18 10:43:16,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:16,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:17,232 WARN L193 SmtUtils]: Spent 420.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:17,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:17,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:17,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:17,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537818158] [2020-08-18 10:43:17,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:17,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:17,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529740541] [2020-08-18 10:43:17,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:17,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:17,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:17,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:17,341 INFO L87 Difference]: Start difference. First operand 15604 states and 23893 transitions. Second operand 4 states. [2020-08-18 10:43:25,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 10:43:25,451 INFO L93 Difference]: Finished difference Result 46737 states and 71555 transitions. [2020-08-18 10:43:25,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 10:43:25,452 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 328 [2020-08-18 10:43:25,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 10:43:25,522 INFO L225 Difference]: With dead ends: 46737 [2020-08-18 10:43:25,523 INFO L226 Difference]: Without dead ends: 31175 [2020-08-18 10:43:25,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:25,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31175 states. [2020-08-18 10:43:27,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31175 to 15623. [2020-08-18 10:43:27,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15623 states. [2020-08-18 10:43:27,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15623 states to 15623 states and 23921 transitions. [2020-08-18 10:43:27,146 INFO L78 Accepts]: Start accepts. Automaton has 15623 states and 23921 transitions. Word has length 328 [2020-08-18 10:43:27,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 10:43:27,147 INFO L479 AbstractCegarLoop]: Abstraction has 15623 states and 23921 transitions. [2020-08-18 10:43:27,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 10:43:27,147 INFO L276 IsEmpty]: Start isEmpty. Operand 15623 states and 23921 transitions. [2020-08-18 10:43:27,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-08-18 10:43:27,183 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 10:43:27,184 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] [2020-08-18 10:43:27,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 10:43:27,184 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 10:43:27,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 10:43:27,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1133119755, now seen corresponding path program 1 times [2020-08-18 10:43:27,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 10:43:27,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009392059] [2020-08-18 10:43:27,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 10:43:27,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:27,700 WARN L193 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 10:43:27,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 10:43:27,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 10:43:27,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 10:43:27,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009392059] [2020-08-18 10:43:27,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 10:43:27,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 10:43:27,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037102182] [2020-08-18 10:43:27,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 10:43:27,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 10:43:27,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 10:43:27,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 10:43:27,808 INFO L87 Difference]: Start difference. First operand 15623 states and 23921 transitions. Second operand 4 states.